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What is the Least Common Multiple of 3916 and 3920?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least common multiple (LCM) of 3916 and 3920 is 3837680.

LCM(3916,3920) = 3837680

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Least Common Multiple of 3916 and 3920 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3916 and 3920, than apply into the LCM equation.

GCF(3916,3920) = 4
LCM(3916,3920) = ( 3916 × 3920) / 4
LCM(3916,3920) = 15350720 / 4
LCM(3916,3920) = 3837680

Least Common Multiple (LCM) of 3916 and 3920 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3916 and 3920. First we will calculate the prime factors of 3916 and 3920.

Prime Factorization of 3916

Prime factors of 3916 are 2, 11, 89. Prime factorization of 3916 in exponential form is:

3916 = 22 × 111 × 891

Prime Factorization of 3920

Prime factors of 3920 are 2, 5, 7. Prime factorization of 3920 in exponential form is:

3920 = 24 × 51 × 72

Now multiplying the highest exponent prime factors to calculate the LCM of 3916 and 3920.

LCM(3916,3920) = 24 × 111 × 891 × 51 × 72
LCM(3916,3920) = 3837680