GCF (HCF) of 39 and 40

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What is the Greatest Common Divisor of 39 and 40?

Answer

GCF (HCF) of 39 and 40 is
1

Common factors: 1

Only 1 divides both: 39 and 40 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 39 × 40 = 1,560.

39 = 3 × 13

40 = 23 × 5

Prime3940Lowest power
2—23—
33——
5—5—
1313——

— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.

GCF = 1

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GCF Table

Number 1Number 2GCF
39401
39411
39423
39431
39453
39461
39471
39483
39491
39513
395213
39531
39543
39561
396513
3913013

FAQ

What is the Greatest Common Divisor of 39 and 40?

GCF (HCF) of 39 and 40 is 1

How to find the GCF of 39 and 40?

You can find the GCF of 39 and 40 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 39 and 40 is 1.

What prime factors do 39 and 40 share?

39 and 40 have no prime factor in common, so the only integer that divides both of them is 1 and their GCF is 1.

How does the GCF reduce the fraction 39/40?

Divide the numerator and the denominator by the GCF 1: 39 ÷ 1 = 39 and 40 ÷ 1 = 40. So 39/40 in lowest terms is 39/40.

Are 39 and 40 coprime?

Yes, 39 and 40 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also