Q: What is the prime factorization of the number 1,984,512?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 17 x 19
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 17, 19 }
  • Written in exponential form: 211 x 31 x 171 x 191

Why is the prime factorization of 1,984,512 written as 211 x 31 x 171 x 191?

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 1,984,512

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 1,984,512 by 2

1,984,512 ÷ 2 = 992,256 - No remainder! 2 is one of the factors!
992,256 ÷ 2 = 496,128 - No remainder! 2 is one of the factors!
496,128 ÷ 2 = 248,064 - No remainder! 2 is one of the factors!
248,064 ÷ 2 = 124,032 - No remainder! 2 is one of the factors!
124,032 ÷ 2 = 62,016 - No remainder! 2 is one of the factors!
62,016 ÷ 2 = 31,008 - No remainder! 2 is one of the factors!
31,008 ÷ 2 = 15,504 - No remainder! 2 is one of the factors!
15,504 ÷ 2 = 7,752 - No remainder! 2 is one of the factors!
7,752 ÷ 2 = 3,876 - No remainder! 2 is one of the factors!
3,876 ÷ 2 = 1,938 - No remainder! 2 is one of the factors!
1,938 ÷ 2 = 969 - No remainder! 2 is one of the factors!
969 ÷ 2 = 484.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
969 ÷ 3 = 323 - No remainder! 3 is one of the factors!
323 ÷ 3 = 107.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
323 ÷ 5 = 64.6 - This has a remainder. 5 is not a factor.
323 ÷ 7 = 46.1429 - This has a remainder. 7 is not a factor.
323 ÷ 11 = 29.3636 - This has a remainder. 11 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
323 ÷ 17 = 19 - No remainder! 17 is one of the factors!
19 ÷ 17 = 1.1176 - There is a remainder. We can't divide by 17 evenly anymore. Let's try the next prime number
19 ÷ 19 = 1 - No remainder! 19 is one of the factors!

The orange divisor(s) above are the prime factors of the number 1,984,512. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 17 x 19 = 1,984,512. It can also be written in exponential form as 211 x 31 x 171 x 191.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 1,984,512.

1,984,512
Factor Arrows
2992,256
Factor Arrows
2496,128
Factor Arrows
2248,064
Factor Arrows
2124,032
Factor Arrows
262,016
Factor Arrows
231,008
Factor Arrows
215,504
Factor Arrows
27,752
Factor Arrows
23,876
Factor Arrows
21,938
Factor Arrows
2969
Factor Arrows
3323
Factor Arrows
1719

More Prime Factorization Examples

1,984,5101,984,5111,984,5131,984,514
21 x 51 x 111 x 18,04111,984,5111611 x 32,533121 x 71 x 2291 x 6191

Try the factor calculator

Explore more about the number 1,984,512:


Ask a Question