400666864 has 20 divisors (see below), whose sum is σ = 836007256. Its totient is φ = 184923072.

The previous prime is 400666859. The next prime is 400666891. The reversal of 400666864 is 468666004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962934 + ... + 963349.

Almost surely, 2^400666864 is an apocalyptic number.

It is an amenable number.

400666864 is an abundant number, since it is smaller than the sum of its proper divisors (435340392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400666864 is a wasteful number, since it uses less digits than its factorization.

400666864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926304 (or 1926298 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 400666864 is about 20016.6646572300. The cubic root of 400666864 is about 737.2155303915.

The spelling of 400666864 in words is "four hundred million, six hundred sixty-six thousand, eight hundred sixty-four".