15964351 divided by 39 
Let's see how many times 39 fits into 15964351.

Going ahead to step 1:
39 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 39

Going ahead to step 2:
39 goes into 15 0 times with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 39

Advancing to step 3:
The number 39 fits into 159 4 times, leaving a remainder of 3.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 3 after subtracting 156 from 159.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 39

Moving on to step 4:
The number 39 fits into 36 0 times, leaving a remainder of 36.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Deduct 0 from 36 and we're left with 36.
Append the next digit (4) from the dividend to 36 and continue with: 364 / 39

Let's proceed to step 5:
If we divide 364 by 39, we get 9 and a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 409.0
Subtracting 351 from 364 leaves us with 13.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 39

Advancing to step 6:
If we divide 133 by 39, we get 3 and a remainder of 16.
Use 3 as the next digit of our solution. 
Result so far: 4093.0
If we take 117 away from 133, we end up with 16.
Grab the next digit (5) from the dividend, add it to 16, then carry on: 165 / 39

On to step 7:
39 can be fit into 165 4 times, resulting in a remainder of 9.
Write down 4 as next digit of the result. 
Result so far: 40934.0
If we subtract 156 from 165, we get 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 39

Moving on to step 8:
If we divide 91 by 39, we get 2 and a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 409342.0
Subtract 78 from 91 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 9:
130 divided by 39 is 3 with a remainder of 13.
Record the quotient 3 as the next digit in the result. 
Result so far: 409342.3
If we take 117 away from 130, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 10:
39 goes into 130 3 times with a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 409342.33
If we subtract 117 from 130, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final result is 409342.33 with a remainder of 0.013.