393459 divided by 8 
Let's see how many times 8 fits into 393459.

Going ahead to step 1:
3 divided by 8 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 8

On to step 2:
When dividing 39 by 8, we get 4 with a remainder of 7.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 32 from 39 to get 7.
Append the next digit (3) from the dividend to 7 and continue with: 73 / 8

Step 3:
If we divide 73 by 8, we get 9 and a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 49.0
Subtract 72 from 73 to get 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 8

Let's proceed to step 4:
14 divided by 8 is 1 with a remainder of 6.
The next digit of our result is 1. 
Result so far: 491.0
Subtracting 8 from 14 leaves us with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 8

Moving on to step 5:
8 can be fit into 65 8 times, resulting in a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 4918.0
Deduct 64 from 65 and we're left with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 8

Moving on to step 6:
When dividing 19 by 8, we get 2 with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 49182.0
Subtracting 16 from 19 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
8 can be fit into 30 3 times, resulting in a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 49182.3
Deduct 24 from 30 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
60 divided by 8 is 7 with a remainder of 4.
The next digit of our result is 7. 
Result so far: 49182.37
Subtract 56 from 60 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 9:
40 divided by 8 is 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 49182.375
Subtracting 40 from 40 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 10:
8 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 49182.375
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 11:
8 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 49182.375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 49182.375 with a remaining 0.0.