We're dividing 15396504 by 401 
We want to figure out the number of times 15396504 can be divided by 401.

Moving on to step 1:
The number 401 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 401

Advancing to step 2:
401 can be fit into 15 0 times, resulting in a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 401

Moving on to step 3:
When dividing 153 by 401, we get 0 with a remainder of 153.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 153 after subtracting 0 from 153.
Include the next digit (9) from the dividend after 153, then repeat: 1539 / 401

Going ahead to step 4:
1539 divided by 401 is 3 with a remainder of 336.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 336 after subtracting 1203 from 1539.
Take the next digit (6) from the dividend and append it to 336, then repeat: 3366 / 401

Moving on to step 5:
401 goes into 3366 8 times with a remainder of 158.
Write down 8 as next digit of the result. 
Result so far: 38.0
Subtract 3208 from 3366 to get 158.
Grab the next digit (5) from the dividend, add it to 158, then carry on: 1585 / 401

Let's proceed to step 6:
The number 401 fits into 1585 3 times, leaving a remainder of 382.
The next digit of our result is 3. 
Result so far: 383.0
If we subtract 1203 from 1585, we get 382.
Take the next digit (0) from the dividend and append it to 382, then repeat: 3820 / 401

Step 7:
If we divide 3820 by 401, we get 9 and a remainder of 211.
Write down 9 as next digit of the result. 
Result so far: 3839.0
The remainder is 211 after subtracting 3609 from 3820.
Append the next digit (4) from the dividend to 211 and continue with: 2114 / 401

Advancing to step 8:
If we divide 2114 by 401, we get 5 and a remainder of 109.
Put 5 as the next digit of the answer. 
Result so far: 38395.0
If we subtract 2005 from 2114, we get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Step 9:
401 goes into 1090 2 times with a remainder of 288.
Record the quotient 2 as the next digit in the result. 
Result so far: 38395.2
The remainder is 288 after subtracting 802 from 1090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Step 10:
The number 401 fits into 2880 7 times, leaving a remainder of 73.
The number 7 becomes the next digit in our result. 
Result so far: 38395.27
Deduct 2807 from 2880 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 11:
When dividing 730 by 401, we get 1 with a remainder of 329.
Write down 1 as next digit of the result. 
Result so far: 38395.271
If we take 401 away from 730, we end up with 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Step 12:
401 goes into 3290 8 times with a remainder of 82.
The number 8 becomes the next digit in our result. 
Result so far: 38395.2718
If we subtract 3208 from 3290, we get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 13:
If we divide 820 by 401, we get 2 and a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 38395.27182
Subtract 802 from 820 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 14:
401 goes into 180 0 times with a remainder of 180.
Use 0 as the next digit of our solution. 
Result so far: 38395.27182
The remainder is 180 after subtracting 0 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Moving on to step 15:
The number 401 fits into 1800 4 times, leaving a remainder of 196.
Put 4 as the next digit of the answer. 
Result so far: 38395.2718204
If we subtract 1604 from 1800, we get 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Going ahead to step 16:
When dividing 1960 by 401, we get 4 with a remainder of 356.
Write down 4 as next digit of the result. 
Result so far: 38395.27182044
If we take 1604 away from 1960, we end up with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

The final outcome is 38395.27182044, with a leftover of 3.56e-07.