A:
Positive:
1 x 19919755 x 39839517 x 11717525 x 7967943 x 4632585 x 23435109 x 18275215 x 9265425 x 4687545 x 3655731 x 27251075 x 1853
Negative:
-1 x -1991975-5 x -398395-17 x -117175-25 x -79679-43 x -46325-85 x -23435-109 x -18275-215 x -9265-425 x -4687-545 x -3655-731 x -2725-1075 x -1853
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 1,991,975, 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 | 1,991,975 | |
| -1 | -1,991,975 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,991,975.
Example:
1 x 1,991,975 = 1,991,975
and
-1 x -1,991,975 = 1,991,975
Notice both answers equal 1,991,975
With that explanation out of the way, let's continue. Next, we take the number 1,991,975 and divide it by 2:
1,991,975 ÷ 2 = 995,987.5
If the quotient is a whole number, then 2 and 995,987.5 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 | 1,991,975 | |
| -1 | -1,991,975 |
Now, we try dividing 1,991,975 by 3:
1,991,975 ÷ 3 = 663,991.6667
If the quotient is a whole number, then 3 and 663,991.6667 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 | 1,991,975 | |
| -1 | -1,991,975 |
Let's try dividing by 4:
1,991,975 ÷ 4 = 497,993.75
If the quotient is a whole number, then 4 and 497,993.75 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 | 1,991,975 | |
| -1 | 1,991,975 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 25 | 43 | 85 | 109 | 215 | 425 | 545 | 731 | 1,075 | 1,853 | 2,725 | 3,655 | 4,687 | 9,265 | 18,275 | 23,435 | 46,325 | 79,679 | 117,175 | 398,395 | 1,991,975 |
| -1 | -5 | -17 | -25 | -43 | -85 | -109 | -215 | -425 | -545 | -731 | -1,075 | -1,853 | -2,725 | -3,655 | -4,687 | -9,265 | -18,275 | -23,435 | -46,325 | -79,679 | -117,175 | -398,395 | -1,991,975 |
Here are some more numbers to try:
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