We're dividing 13586399 by 623 
Let's see how many times 623 fits into 13586399.

Advancing to step 1:
1 divided by 623 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 623

Advancing to step 2:
The number 623 fits into 13 0 times, leaving a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Append the next digit (5) from the dividend to 13 and continue with: 135 / 623

Advancing to step 3:
623 can be fit into 135 0 times, resulting in a remainder of 135.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 135 and we're left with 135.
Bring next digit (8) of the dividend behind the 135 and repeat the process: 1358 / 623

Let's proceed to step 4:
The number 623 fits into 1358 2 times, leaving a remainder of 112.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 112 after subtracting 1246 from 1358.
Grab the next digit (6) from the dividend, add it to 112, then carry on: 1126 / 623

Advancing to step 5:
1126 divided by 623 is 1 with a remainder of 503.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Deduct 623 from 1126 and we're left with 503.
Bring next digit (3) of the dividend behind the 503 and repeat the process: 5033 / 623

Step 6:
5033 divided by 623 is 8 with a remainder of 49.
Put 8 as the next digit of the answer. 
Result so far: 218.0
Subtract 4984 from 5033 to get 49.
Fetch the next digit (9) from the dividend, attach it to 49 and continue: 499 / 623

Step 7:
623 can be fit into 499 0 times, resulting in a remainder of 499.
The next digit of our result is 0. 
Result so far: 2180.0
Subtract 0 from 499 to get 499.
Include the next digit (9) from the dividend after 499, then repeat: 4999 / 623

Step 8:
When dividing 4999 by 623, we get 8 with a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 21808.0
If we subtract 4984 from 4999, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 9:
The number 623 fits into 150 0 times, leaving a remainder of 150.
Write down 0 as next digit of the result. 
Result so far: 21808.0
If we subtract 0 from 150, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 10:
623 can be fit into 1500 2 times, resulting in a remainder of 254.
Use 2 as the next digit of our solution. 
Result so far: 21808.02
Subtracting 1246 from 1500 leaves us with 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

On to step 11:
When dividing 2540 by 623, we get 4 with a remainder of 48.
Use 4 as the next digit of our solution. 
Result so far: 21808.024
Subtracting 2492 from 2540 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 12:
480 divided by 623 is 0 with a remainder of 480.
The next digit of our result is 0. 
Result so far: 21808.024
If we take 0 away from 480, we end up with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Advancing to step 13:
The number 623 fits into 4800 7 times, leaving a remainder of 439.
Use 7 as the next digit of our solution. 
Result so far: 21808.02407
Subtract 4361 from 4800 to get 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

Let's proceed to step 14:
When dividing 4390 by 623, we get 7 with a remainder of 29.
Record the quotient 7 as the next digit in the result. 
Result so far: 21808.024077
Subtract 4361 from 4390 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 21808.024077 with a remainder of 2.9e-06.