A:
Positive:
1 x 399302455 x 798604929 x 1376905113 x 353365145 x 275381565 x 706732437 x 163853277 x 12185
Negative:
-1 x -39930245-5 x -7986049-29 x -1376905-113 x -353365-145 x -275381-565 x -70673-2437 x -16385-3277 x -12185
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 39,930,245, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 39,930,245 | |
| -1 | -39,930,245 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 39,930,245.
Example:
1 x 39,930,245 = 39,930,245
and
-1 x -39,930,245 = 39,930,245
Notice both answers equal 39,930,245
With that explanation out of the way, let's continue. Next, we take the number 39,930,245 and divide it by 2:
39,930,245 ÷ 2 = 19,965,122.5
If the quotient is a whole number, then 2 and 19,965,122.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 39,930,245 | |
| -1 | -39,930,245 |
Now, we try dividing 39,930,245 by 3:
39,930,245 ÷ 3 = 13,310,081.6667
If the quotient is a whole number, then 3 and 13,310,081.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 39,930,245 | |
| -1 | -39,930,245 |
Let's try dividing by 4:
39,930,245 ÷ 4 = 9,982,561.25
If the quotient is a whole number, then 4 and 9,982,561.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 39,930,245 | |
| -1 | 39,930,245 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 113 | 145 | 565 | 2,437 | 3,277 | 12,185 | 16,385 | 70,673 | 275,381 | 353,365 | 1,376,905 | 7,986,049 | 39,930,245 |
| -1 | -5 | -29 | -113 | -145 | -565 | -2,437 | -3,277 | -12,185 | -16,385 | -70,673 | -275,381 | -353,365 | -1,376,905 | -7,986,049 | -39,930,245 |
Here are some more numbers to try:
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