39951664 has 10 divisors (see below), whose sum is σ = 77406380. Its totient is φ = 19975824.

The previous prime is 39951641. The next prime is 39951679. The reversal of 39951664 is 46615993.

It is a super-2 number, since 2×39951664² = 3192270912737792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39951664.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248474 + ... + 1248505.

It is an arithmetic number, because the mean of its divisors is an integer number (7740638).

Almost surely, 2^39951664 is an apocalyptic number.

It is an amenable number.

39951664 is a deficient number, since it is larger than the sum of its proper divisors (37454716).

39951664 is a wasteful number, since it uses less digits than its factorization.

39951664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496987 (or 2496981 counting only the distinct ones).

The product of its digits is 174960, while the sum is 43.

The square root of 39951664 is about 6320.7328689006. The cubic root of 39951664 is about 341.8573781478.

The spelling of 39951664 in words is "thirty-nine million, nine hundred fifty-one thousand, six hundred sixty-four".