# Q: What are the factor combinations of the number 123,456,789?

A:
Positive:   1 x 1234567893 x 411522639 x 137174213607 x 342273803 x 3246310821 x 11409
Negative: -1 x -123456789-3 x -41152263-9 x -13717421-3607 x -34227-3803 x -32463-10821 x -11409

## How do I find the factor combinations of the number 123,456,789?

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 123,456,789, 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.

 1 123,456,789 -1 -123,456,789

#### 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 123,456,789.

Example:
1 x 123,456,789 = 123,456,789
and
-1 x -123,456,789 = 123,456,789

With that explanation out of the way, let's continue. Next, we take the number 123,456,789 and divide it by 2:

123,456,789 ÷ 2 = 61,728,394.5

If the quotient is a whole number, then 2 and 61,728,394.5 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:

 1 123,456,789 -1 -123,456,789

Now, we try dividing 123,456,789 by 3:

123,456,789 ÷ 3 = 41,152,263

If the quotient is a whole number, then 3 and 41,152,263 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

 1 3 41,152,263 123,456,789 -1 -3 -41,152,263 -123,456,789

Let's try dividing by 4:

123,456,789 ÷ 4 = 30,864,197.25

If the quotient is a whole number, then 4 and 30,864,197.25 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 3 41,152,263 123,456,789 -1 -3 -41,152,263 123,456,789
Keep dividing by the next highest number until you cannot divide anymore.

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

 1 3 9 3,607 3,803 10,821 11,409 32,463 34,227 13,717,421 41,152,263 123,456,789 -1 -3 -9 -3,607 -3,803 -10,821 -11,409 -32,463 -34,227 -13,717,421 -41,152,263 -123,456,789

### More Examples

Here are some more numbers to try:

Try the factor calculator

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