# What is the Greatest Common Factor of 123 and 142?

Greatest common factor (GCF) of 123 and 142 is 1.

GCF(123,142) = 1

We will now calculate the prime factors of 123 and 142, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 123 and 142.

GCF Calculator and
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## How to find the GCF of 123 and 142?

We will first find the prime factorization of 123 and 142. After we will calculate the factors of 123 and 142 and find the biggest common factor number .

### Step-1: Prime Factorization of 123

Prime factors of 123 are 3, 41. Prime factorization of 123 in exponential form is:

123 = 31 × 411

### Step-2: Prime Factorization of 142

Prime factors of 142 are 2, 71. Prime factorization of 142 in exponential form is:

142 = 21 × 711

### Step-3: Factors of 123

List of positive integer factors of 123 that divides 123 without a remainder.

1, 3, 41

### Step-4: Factors of 142

List of positive integer factors of 142 that divides 123 without a remainder.

1, 2, 71

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 123 and 142. The biggest common factor number is the GCF number.
So the greatest common factor 123 and 142 is 1.

Also check out the Least Common Multiple of 123 and 142