A:
Positive:
1 x 21493855 x 4298777 x 30705531 x 6933535 x 6141149 x 43865155 x 13867217 x 9905245 x 8773283 x 75951085 x 19811415 x 1519
Negative:
-1 x -2149385-5 x -429877-7 x -307055-31 x -69335-35 x -61411-49 x -43865-155 x -13867-217 x -9905-245 x -8773-283 x -7595-1085 x -1981-1415 x -1519
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 2,149,385, 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 | 2,149,385 | |
| -1 | -2,149,385 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,149,385.
Example:
1 x 2,149,385 = 2,149,385
and
-1 x -2,149,385 = 2,149,385
Notice both answers equal 2,149,385
With that explanation out of the way, let's continue. Next, we take the number 2,149,385 and divide it by 2:
2,149,385 ÷ 2 = 1,074,692.5
If the quotient is a whole number, then 2 and 1,074,692.5 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 | 2,149,385 | |
| -1 | -2,149,385 |
Now, we try dividing 2,149,385 by 3:
2,149,385 ÷ 3 = 716,461.6667
If the quotient is a whole number, then 3 and 716,461.6667 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 | 2,149,385 | |
| -1 | -2,149,385 |
Let's try dividing by 4:
2,149,385 ÷ 4 = 537,346.25
If the quotient is a whole number, then 4 and 537,346.25 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 | 2,149,385 | |
| -1 | 2,149,385 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 31 | 35 | 49 | 155 | 217 | 245 | 283 | 1,085 | 1,415 | 1,519 | 1,981 | 7,595 | 8,773 | 9,905 | 13,867 | 43,865 | 61,411 | 69,335 | 307,055 | 429,877 | 2,149,385 |
| -1 | -5 | -7 | -31 | -35 | -49 | -155 | -217 | -245 | -283 | -1,085 | -1,415 | -1,519 | -1,981 | -7,595 | -8,773 | -9,905 | -13,867 | -43,865 | -61,411 | -69,335 | -307,055 | -429,877 | -2,149,385 |
Here are some more numbers to try:
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