Greatest Common Factor of 1978 and 1986

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 1978, 1986 i.e. 2 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 1978 and 1986 is 2.

GCF(1978,1986) = 2

GCF of 1978 and 1986

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and

Greatest Common Factor of 1978 and 1986

GCF of 1978 and 1986 is 2

Prime Factorization of 1978


2 1978
23 989
43 43
1

Prime factors of 1978 are 2,23,43. Prime factorization of 1978 in exponential form is:

1978 = 21×231×431

Prime Factorization of 1986


2 1986
3 993
331 331
1

Prime factors of 1986 are 2,3,331. Prime factorization of 1986 in exponential form is:

1986 = 21×31×3311

∴ So by taking common prime factors GCF of 1978 and 1986 is 2

Greatest Common Factor of 1978 and 1986 by matching factors method

Factors of 1978

List of positive integer factors of 1978 that divides 1978 without a remainder.

1,2,23,43,46,86,989,1978

Factors of 1986

List of positive integer factors of 1986 that divides 1986 without a remainder.

1,2,3,6,331,662,993,1986

Greatest Common Factor

We found the factors and prime factorization of 1978 and 1986. The biggest common factor number is the GCF number.
So the greatest common factor 1978 and 1986 is 2.

Also check out the Least Common Multiple of 1978 and 1986

Properties of GCF 1978 and 1986

(i) The GCF of 1978 and 1986 is associative

GCF of 1978 and 1986 = GCF of 1986 and 1978

Related Greatest Common Factor of 1978

Related Greatest Common Factor of 1986

Frequently Asked Questions on GCF of 1978 and 1986

1. What is the GCF of 1978 and 1986?

Answer: GCF of 1978 and 1986 is 2.

2. What are the Factors of 1978?

Answer: Factors of 1978 are 1, 2, 23, 43, 46, 86, 989, 1978. There are 8 integers that are factors of 1978. The greatest factor of 1978 is 1978.

3. What are the Factors of 1986?

Answer: Factors of 1986 are 1, 2, 3, 6, 331, 662, 993, 1986. There are 8 integers that are factors of 1986. The greatest factor of 1986 is 1986.

4. How to Find the GCF of 1978 and 1986?

Answer:

Greatest Common Factor of 1978 and 1986 = 2

Step 1: Find the prime factorization of 1978

1978 = 2 x 23 x 43

Step 2: Find the prime factorization of 1986

1986 = 2 x 3 x 331

Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:

GCF = 2

Step 4: Therefore, the greatest common factor of 1978 and 1986 is 2