GCF and LCM Calculator Logo

What is the Least Common Multiple of 1520 and 1538?

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 1520 and 1538 is 1168880.

LCM(1520,1538) = 1168880

LCM Calculator and
and

Least Common Multiple of 1520 and 1538 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1520 and 1538, than apply into the LCM equation.

GCF(1520,1538) = 2
LCM(1520,1538) = ( 1520 × 1538) / 2
LCM(1520,1538) = 2337760 / 2
LCM(1520,1538) = 1168880

Least Common Multiple (LCM) of 1520 and 1538 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1520 and 1538. First we will calculate the prime factors of 1520 and 1538.

Prime Factorization of 1520

Prime factors of 1520 are 2, 5, 19. Prime factorization of 1520 in exponential form is:

1520 = 24 × 51 × 191

Prime Factorization of 1538

Prime factors of 1538 are 2, 769. Prime factorization of 1538 in exponential form is:

1538 = 21 × 7691

Now multiplying the highest exponent prime factors to calculate the LCM of 1520 and 1538.

LCM(1520,1538) = 24 × 51 × 191 × 7691
LCM(1520,1538) = 1168880