400394976 has 24 divisors (see below), whose sum is σ = 1051037064. Its totient is φ = 133464960.

The previous prime is 400394959. The next prime is 400394983. The reversal of 400394976 is 679493004.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×400394976² = 320632273612081152, which contains 22 as substring.

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, 2085295 + ... + 2085486.

It is an arithmetic number, because the mean of its divisors is an integer number (43793211).

Almost surely, 2^400394976 is an apocalyptic number.

It is an amenable number.

400394976 is an abundant number, since it is smaller than the sum of its proper divisors (650642088).

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

400394976 is a wasteful number, since it uses less digits than its factorization.

400394976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170794 (or 4170786 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 400394976 is about 20009.8719636084. The cubic root of 400394976 is about 737.0487372856.

The spelling of 400394976 in words is "four hundred million, three hundred ninety-four thousand, nine hundred seventy-six".