We divide 403391 by 1
We want to figure out the number of times 403391 can be divided by 1.

Let's proceed to step 1:
When dividing 4 by 1, we get 4 with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 4 from 4 to get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 1

Moving on to step 2:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
If we subtract 0 from 0, we get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 1

On to step 3:
1 goes into 3 3 times with a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 403.0
Subtracting 3 from 3 leaves us with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 1

Step 4:
If we divide 3 by 1, we get 3 and a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 4033.0
Subtracting 3 from 3 leaves us with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 1

Let's proceed to step 5:
9 divided by 1 is 9 with a remainder of 0.
The next digit of our result is 9. 
Result so far: 40339.0
Subtract 9 from 9 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

On to step 6:
1 divided by 1 is 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 403391.0
Subtract 1 from 1 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 403391.0
If we take 0 away from 0, we end up 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.

On to step 8:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 403391.0
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.

In conclusion, the division gives 403391.0 with a balance of 0.0.