What is the Least Common Multiple of 1987 and 2005?

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 of 1987 and 2005 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1987 and 2005, than apply into the LCM equation.

GCF(1987,2005) = 1
LCM(1987,2005) = ( 1987 × 2005) / 1
LCM(1987,2005) = 3983935 / 1
LCM(1987,2005) = 3983935

Least Common Multiple (LCM) of 1987 and 2005 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1987 and 2005. First we will calculate the prime factors of 1987 and 2005.

Prime Factorization of 1987

Prime Factorization of 2005

Now multiplying the highest exponent prime factors to calculate the LCM of 1987 and 2005.

LCM(1987,2005) = 1987¹ × 5¹ × 401¹
LCM(1987,2005) = 3983935