# What is the Greatest Common Factor of 39 and 43?

Greatest common factor (GCF) of 39 and 43 is 1.

GCF(39,43) = 1

We will now calculate the prime factors of 39 and 43, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 39 and 43.

GCF Calculator and
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## How to find the GCF of 39 and 43?

We will first find the prime factorization of 39 and 43. After we will calculate the factors of 39 and 43 and find the biggest common factor number .

### Step-1: Prime Factorization of 39

Prime factors of 39 are 3, 13. Prime factorization of 39 in exponential form is:

39 = 31 × 131

### Step-2: Prime Factorization of 43

Prime factors of 43 are 43. Prime factorization of 43 in exponential form is:

43 = 431

### Step-3: Factors of 39

List of positive integer factors of 39 that divides 39 without a remainder.

1, 3, 13

### Step-4: Factors of 43

List of positive integer factors of 43 that divides 39 without a remainder.

1

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 39 and 43. The biggest common factor number is the GCF number.
So the greatest common factor 39 and 43 is 1.

Also check out the Least Common Multiple of 39 and 43