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What is the Least Common Multiple of 3987 and 3998?

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 3987 and 3998 is 15940026.

LCM(3987,3998) = 15940026

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Least Common Multiple of 3987 and 3998 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3987 and 3998, than apply into the LCM equation.

GCF(3987,3998) = 1
LCM(3987,3998) = ( 3987 × 3998) / 1
LCM(3987,3998) = 15940026 / 1
LCM(3987,3998) = 15940026

Least Common Multiple (LCM) of 3987 and 3998 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3987 and 3998. First we will calculate the prime factors of 3987 and 3998.

Prime Factorization of 3987

Prime factors of 3987 are 3, 443. Prime factorization of 3987 in exponential form is:

3987 = 32 × 4431

Prime Factorization of 3998

Prime factors of 3998 are 2, 1999. Prime factorization of 3998 in exponential form is:

3998 = 21 × 19991

Now multiplying the highest exponent prime factors to calculate the LCM of 3987 and 3998.

LCM(3987,3998) = 32 × 4431 × 21 × 19991
LCM(3987,3998) = 15940026