39666987 has 12 divisors (see below), whose sum is σ = 57461040. Its totient is φ = 26368848.

The previous prime is 39666971. The next prime is 39667031. The reversal of 39666987 is 78966693.

It is a happy number.

39666987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39666987 - 2⁴ = 39666971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39666917) 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 in 11 ways as a sum of consecutive naturals, for example, 2908 + ... + 9369.

It is an arithmetic number, because the mean of its divisors is an integer number (4788420).

Almost surely, 2^39666987 is an apocalyptic number.

39666987 is a deficient number, since it is larger than the sum of its proper divisors (17794053).

39666987 is a wasteful number, since it uses less digits than its factorization.

39666987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12642 (or 12639 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 39666987 is about 6298.1733066025. The cubic root of 39666987 is about 341.0434696034.

The spelling of 39666987 in words is "thirty-nine million, six hundred sixty-six thousand, nine hundred eighty-seven".