Q: What are the prime factors of the number 392,904?

 A: 2, 3, 17, 107

Why are those the prime factors of the number 392,904?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 392,904

392,904
Factor Arrows
2196,452
Factor Arrows
298,226
Factor Arrows
249,113
Factor Arrows
316,371
Factor Arrows
35,457
Factor Arrows
31,819
Factor Arrows
17107

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 3, 17, 107

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 3 x 3 x 3 x 17 x 107 = 392,904

This can also be written as 23 x 33 x 171 x 1071 = 392,904

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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