A:
Positive:
1 x 123981555 x 24796317 x 177116511 x 112710535 x 35423355 x 22542177 x 161015385 x 32203
Negative:
-1 x -12398155-5 x -2479631-7 x -1771165-11 x -1127105-35 x -354233-55 x -225421-77 x -161015-385 x -32203
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 12,398,155, 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 | 12,398,155 | |
| -1 | -12,398,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,398,155.
Example:
1 x 12,398,155 = 12,398,155
and
-1 x -12,398,155 = 12,398,155
Notice both answers equal 12,398,155
With that explanation out of the way, let's continue. Next, we take the number 12,398,155 and divide it by 2:
12,398,155 ÷ 2 = 6,199,077.5
If the quotient is a whole number, then 2 and 6,199,077.5 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 | 12,398,155 | |
| -1 | -12,398,155 |
Now, we try dividing 12,398,155 by 3:
12,398,155 ÷ 3 = 4,132,718.3333
If the quotient is a whole number, then 3 and 4,132,718.3333 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 | 12,398,155 | |
| -1 | -12,398,155 |
Let's try dividing by 4:
12,398,155 ÷ 4 = 3,099,538.75
If the quotient is a whole number, then 4 and 3,099,538.75 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 | 12,398,155 | |
| -1 | 12,398,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 11 | 35 | 55 | 77 | 385 | 32,203 | 161,015 | 225,421 | 354,233 | 1,127,105 | 1,771,165 | 2,479,631 | 12,398,155 |
| -1 | -5 | -7 | -11 | -35 | -55 | -77 | -385 | -32,203 | -161,015 | -225,421 | -354,233 | -1,127,105 | -1,771,165 | -2,479,631 | -12,398,155 |
Here are some more numbers to try:
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