What is the Greatest Common Factor of 438 and 455?

Greatest common factor (GCF) of 438 and 455 is 1.

GCF(438,455) = 1

We will now calculate the prime factors of 438 and 455, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 438 and 455.

How to find the GCF of 438 and 455?

We will first find the prime factorization of 438 and 455. After we will calculate the factors of 438 and 455 and find the biggest common factor number .

Step-1: Prime Factorization of 438

Prime factors of 438 are 2, 3, 73. Prime factorization of 438 in exponential form is:

438 = 2¹ × 3¹ × 73¹

Step-2: Prime Factorization of 455

Prime factors of 455 are 5, 7, 13. Prime factorization of 455 in exponential form is:

455 = 5¹ × 7¹ × 13¹

Step-3: Factors of 438

List of positive integer factors of 438 that divides 438 without a remainder.

1, 2, 3, 6, 73, 146, 219

Step-4: Factors of 455

List of positive integer factors of 455 that divides 438 without a remainder.

1, 5, 7, 13, 35, 65, 91

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 438 and 455. The biggest common factor number is the GCF number.
So the greatest common factor 438 and 455 is 1.

Also check out the Least Common Multiple of 438 and 455