Q: What are the prime factors of the number 390,905?

Why are those the prime factors of the number 390,905?

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 390,905

	390,905
5		78,181
	37		2,113

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:

5, 37, 2113

We can check our work by multiplying all of the prime factors together: 5 x 37 x 2,113 = 390,905

This can also be written as 5¹ x 37¹ x 2,113¹ = 390,905

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

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