39131987 has 2 divisors, whose sum is σ = 39131988. Its totient is φ = 39131986.

The previous prime is 39131971. The next prime is 39132007. The reversal of 39131987 is 78913193.

39131987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39131987 - 2⁴ = 39131971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39131387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19565993 + 19565994.

It is an arithmetic number, because the mean of its divisors is an integer number (19565994).

Almost surely, 2^39131987 is an apocalyptic number.

39131987 is a deficient number, since it is larger than the sum of its proper divisors (1).

39131987 is an equidigital number, since it uses as much as digits as its factorization.

39131987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 39131987 is about 6255.5564900335. The cubic root of 39131987 is about 339.5032740807.

The spelling of 39131987 in words is "thirty-nine million, one hundred thirty-one thousand, nine hundred eighty-seven".