A:
Positive:
1 x 19782077 x 28260111 x 17983723 x 8600977 x 25691161 x 12287253 x 78191117 x 1771
Negative:
-1 x -1978207-7 x -282601-11 x -179837-23 x -86009-77 x -25691-161 x -12287-253 x -7819-1117 x -1771
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 1,978,207, 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 | 1,978,207 | |
| -1 | -1,978,207 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,978,207.
Example:
1 x 1,978,207 = 1,978,207
and
-1 x -1,978,207 = 1,978,207
Notice both answers equal 1,978,207
With that explanation out of the way, let's continue. Next, we take the number 1,978,207 and divide it by 2:
1,978,207 ÷ 2 = 989,103.5
If the quotient is a whole number, then 2 and 989,103.5 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 | 1,978,207 | |
| -1 | -1,978,207 |
Now, we try dividing 1,978,207 by 3:
1,978,207 ÷ 3 = 659,402.3333
If the quotient is a whole number, then 3 and 659,402.3333 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 | 1,978,207 | |
| -1 | -1,978,207 |
Let's try dividing by 4:
1,978,207 ÷ 4 = 494,551.75
If the quotient is a whole number, then 4 and 494,551.75 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 | 1,978,207 | |
| -1 | 1,978,207 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 23 | 77 | 161 | 253 | 1,117 | 1,771 | 7,819 | 12,287 | 25,691 | 86,009 | 179,837 | 282,601 | 1,978,207 |
| -1 | -7 | -11 | -23 | -77 | -161 | -253 | -1,117 | -1,771 | -7,819 | -12,287 | -25,691 | -86,009 | -179,837 | -282,601 | -1,978,207 |
Here are some more numbers to try:
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