What is the Greatest Common Factor of 398 and 403?

Greatest common factor (GCF) of 398 and 403 is 1.

GCF(398,403) = 1

We will now calculate the prime factors of 398 and 403, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 398 and 403.

How to find the GCF of 398 and 403?

We will first find the prime factorization of 398 and 403. After we will calculate the factors of 398 and 403 and find the biggest common factor number .

Step-1: Prime Factorization of 398

Prime factors of 398 are 2, 199. Prime factorization of 398 in exponential form is:

398 = 2¹ × 199¹

Step-2: Prime Factorization of 403

Prime factors of 403 are 13, 31. Prime factorization of 403 in exponential form is:

403 = 13¹ × 31¹

Step-3: Factors of 398

List of positive integer factors of 398 that divides 398 without a remainder.

1, 2, 199

Step-4: Factors of 403

List of positive integer factors of 403 that divides 398 without a remainder.

1, 13, 31

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 398 and 403. The biggest common factor number is the GCF number.
So the greatest common factor 398 and 403 is 1.

Also check out the Least Common Multiple of 398 and 403