Q: What are the prime factors of the number 420,123,000?

 A: 2, 3, 5, 11, 29, 439

Why are those the prime factors of the number 420,123,000?

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 420,123,000

420,123,000
Factor Arrows
2210,061,500
Factor Arrows
2105,030,750
Factor Arrows
252,515,375
Factor Arrows
317,505,125
Factor Arrows
53,501,025
Factor Arrows
5700,205
Factor Arrows
5140,041
Factor Arrows
1112,731
Factor Arrows
29439

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, 5, 11, 29, 439

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 3 x 5 x 5 x 5 x 11 x 29 x 439 = 420,123,000

This can also be written as 23 x 31 x 53 x 111 x 291 x 4391 = 420,123,000

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


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