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What is the Least Common Multiple of 1986 and 1991?

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 1986 and 1991 is 3954126.

LCM(1986,1991) = 3954126

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Least Common Multiple of 1986 and 1991 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1986 and 1991, than apply into the LCM equation.

GCF(1986,1991) = 1
LCM(1986,1991) = ( 1986 × 1991) / 1
LCM(1986,1991) = 3954126 / 1
LCM(1986,1991) = 3954126

Least Common Multiple (LCM) of 1986 and 1991 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1986 and 1991. First we will calculate the prime factors of 1986 and 1991.

Prime Factorization of 1986

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

1986 = 21 × 31 × 3311

Prime Factorization of 1991

Prime factors of 1991 are 11, 181. Prime factorization of 1991 in exponential form is:

1991 = 111 × 1811

Now multiplying the highest exponent prime factors to calculate the LCM of 1986 and 1991.

LCM(1986,1991) = 21 × 31 × 3311 × 111 × 1811
LCM(1986,1991) = 3954126