15905081 divided by 399 
Let's see how many times 399 fits into 15905081.

On to step 1:
If we divide 1 by 399, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 399

Advancing to step 2:
399 goes into 15 0 times with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 399

Moving on to step 3:
When dividing 159 by 399, we get 0 with a remainder of 159.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 159, we get 159.
Append the next digit (0) from the dividend to 159 and continue with: 1590 / 399

Step 4:
If we divide 1590 by 399, we get 3 and a remainder of 393.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 1197 from 1590 and we're left with 393.
Take the next digit (5) from the dividend and append it to 393, then repeat: 3935 / 399

Going ahead to step 5:
The number 399 fits into 3935 9 times, leaving a remainder of 344.
Use 9 as the next digit of our solution. 
Result so far: 39.0
Subtracting 3591 from 3935 leaves us with 344.
Append the next digit (0) from the dividend to 344 and continue with: 3440 / 399

Step 6:
If we divide 3440 by 399, we get 8 and a remainder of 248.
The next digit of our result is 8. 
Result so far: 398.0
The remainder is 248 after subtracting 3192 from 3440.
Take the next digit (8) from the dividend and append it to 248, then repeat: 2488 / 399

Going ahead to step 7:
The number 399 fits into 2488 6 times, leaving a remainder of 94.
The next digit of our result is 6. 
Result so far: 3986.0
Subtract 2394 from 2488 to get 94.
Bring next digit (1) of the dividend behind the 94 and repeat the process: 941 / 399

Step 8:
399 goes into 941 2 times with a remainder of 143.
The next digit of our result is 2. 
Result so far: 39862.0
Subtracting 798 from 941 leaves us with 143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

Moving on to step 9:
1430 divided by 399 is 3 with a remainder of 233.
Write down 3 as next digit of the result. 
Result so far: 39862.3
If we take 1197 away from 1430, we end up with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Let's proceed to step 10:
The number 399 fits into 2330 5 times, leaving a remainder of 335.
Put 5 as the next digit of the answer. 
Result so far: 39862.35
If we subtract 1995 from 2330, we get 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Moving on to step 11:
The number 399 fits into 3350 8 times, leaving a remainder of 158.
The number 8 becomes the next digit in our result. 
Result so far: 39862.358
The remainder is 158 after subtracting 3192 from 3350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Going ahead to step 12:
399 goes into 1580 3 times with a remainder of 383.
Put 3 as the next digit of the answer. 
Result so far: 39862.3583
Deduct 1197 from 1580 and we're left with 383.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3830, and continue the process.

Moving on to step 13:
399 can be fit into 3830 9 times, resulting in a remainder of 239.
Record the quotient 9 as the next digit in the result. 
Result so far: 39862.35839
The remainder is 239 after subtracting 3591 from 3830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Moving on to step 14:
When dividing 2390 by 399, we get 5 with a remainder of 395.
Put 5 as the next digit of the answer. 
Result so far: 39862.358395
Subtract 1995 from 2390 to get 395.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3950, and continue the process.

Going ahead to step 15:
If we divide 3950 by 399, we get 9 and a remainder of 359.
Put 9 as the next digit of the answer. 
Result so far: 39862.3583959
If we take 3591 away from 3950, we end up with 359.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3590, and continue the process.

On to step 16:
399 can be fit into 3590 8 times, resulting in a remainder of 398.
Record the quotient 8 as the next digit in the result. 
Result so far: 39862.35839598
The remainder is 398 after subtracting 3192 from 3590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

In conclusion, the division gives 39862.35839598 with a balance of 3.98e-07.