Q: What is the prime factorization of the number 424,384?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 19 x 349
    • or also written as { 2, 2, 2, 2, 2, 2, 19, 349 }
  • Written in exponential form: 26 x 191 x 3491

Why is the prime factorization of 424,384 written as 26 x 191 x 3491?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 424,384

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 424,384 by 2

424,384 ÷ 2 = 212,192 - No remainder! 2 is one of the factors!
212,192 ÷ 2 = 106,096 - No remainder! 2 is one of the factors!
106,096 ÷ 2 = 53,048 - No remainder! 2 is one of the factors!
53,048 ÷ 2 = 26,524 - No remainder! 2 is one of the factors!
26,524 ÷ 2 = 13,262 - No remainder! 2 is one of the factors!
13,262 ÷ 2 = 6,631 - No remainder! 2 is one of the factors!
6,631 ÷ 2 = 3,315.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
6,631 ÷ 3 = 2,210.3333 - This has a remainder. 3 is not a factor.
6,631 ÷ 5 = 1,326.2 - This has a remainder. 5 is not a factor.
6,631 ÷ 7 = 947.2857 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
6,631 ÷ 19 = 349 - No remainder! 19 is one of the factors!
349 ÷ 19 = 18.3684 - There is a remainder. We can't divide by 19 evenly anymore. Let's try the next prime number
349 ÷ 23 = 15.1739 - This has a remainder. 23 is not a factor.
349 ÷ 29 = 12.0345 - This has a remainder. 29 is not a factor.
349 ÷ 31 = 11.2581 - This has a remainder. 31 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
349 ÷ 349 = 1 - No remainder! 349 is one of the factors!

The orange divisor(s) above are the prime factors of the number 424,384. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 19 x 349 = 424,384. It can also be written in exponential form as 26 x 191 x 3491.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 424,384.

424,384
Factor Arrows
2212,192
Factor Arrows
2106,096
Factor Arrows
253,048
Factor Arrows
226,524
Factor Arrows
213,262
Factor Arrows
26,631
Factor Arrows
19349

More Prime Factorization Examples

424,382424,383424,385424,386
21 x 71 x 30,313131 x 141,461151 x 131 x 6,529121 x 33 x 291 x 2711

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