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What is the Least Common Multiple of 391 and 401?

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 391 and 401 is 156791.

LCM(391,401) = 156791

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Least Common Multiple of 391 and 401 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 391 and 401, than apply into the LCM equation.

GCF(391,401) = 1
LCM(391,401) = ( 391 × 401) / 1
LCM(391,401) = 156791 / 1
LCM(391,401) = 156791

Least Common Multiple (LCM) of 391 and 401 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 391 and 401. First we will calculate the prime factors of 391 and 401.

Prime Factorization of 391

Prime factors of 391 are 17, 23. Prime factorization of 391 in exponential form is:

391 = 171 × 231

Prime Factorization of 401

Prime factors of 401 are 401. Prime factorization of 401 in exponential form is:

401 = 4011

Now multiplying the highest exponent prime factors to calculate the LCM of 391 and 401.

LCM(391,401) = 171 × 231 × 4011
LCM(391,401) = 156791