Q: What are the factor combinations of the number 409,487?

 A:
Positive:   1 x 40948713 x 31499169 x 2423
Negative: -1 x -409487-13 x -31499-169 x -2423


How do I find the factor combinations of the number 409,487?

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 409,487, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

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.

1 409,487
-1 -409,487

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 409,487.

Example:
1 x 409,487 = 409,487
and
-1 x -409,487 = 409,487
Notice both answers equal 409,487

With that explanation out of the way, let's continue. Next, we take the number 409,487 and divide it by 2:

409,487 ÷ 2 = 204,743.5

If the quotient is a whole number, then 2 and 204,743.5 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:

1 409,487
-1 -409,487

Now, we try dividing 409,487 by 3:

409,487 ÷ 3 = 136,495.6667

If the quotient is a whole number, then 3 and 136,495.6667 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:

1 409,487
-1 -409,487

Let's try dividing by 4:

409,487 ÷ 4 = 102,371.75

If the quotient is a whole number, then 4 and 102,371.75 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:

1 409,487
-1 409,487
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

1131692,42331,499409,487
-1-13-169-2,423-31,499-409,487

More Examples

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