39972187 has 2 divisors, whose sum is σ = 39972188. Its totient is φ = 39972186.

The previous prime is 39972157. The next prime is 39972193. The reversal of 39972187 is 78127993.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39972187 - 2⁷ = 39972059 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39972157) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19986093 + 19986094.

It is an arithmetic number, because the mean of its divisors is an integer number (19986094).

Almost surely, 2^39972187 is an apocalyptic number.

39972187 is a deficient number, since it is larger than the sum of its proper divisors (1).

39972187 is an equidigital number, since it uses as much as digits as its factorization.

39972187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 39972187 is about 6322.3561272677. The cubic root of 39972187 is about 341.9159050214.

The spelling of 39972187 in words is "thirty-nine million, nine hundred seventy-two thousand, one hundred eighty-seven".