# What is the Greatest Common Factor of 123 and 139?

Greatest common factor (GCF) of 123 and 139 is 1.

GCF(123,139) = 1

We will now calculate the prime factors of 123 and 139, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 123 and 139.

GCF Calculator and
and

## How to find the GCF of 123 and 139?

We will first find the prime factorization of 123 and 139. After we will calculate the factors of 123 and 139 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 139

Prime factors of 139 are 139. Prime factorization of 139 in exponential form is:

139 = 1391

### 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 139

List of positive integer factors of 139 that divides 123 without a remainder.

1

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 123 and 139. The biggest common factor number is the GCF number.
So the greatest common factor 123 and 139 is 1.

Also check out the Least Common Multiple of 123 and 139