400865004 has 24 divisors (see below), whose sum is σ = 1039279920. Its totient is φ = 133621632.

The previous prime is 400864991. The next prime is 400865009. The reversal of 400865004 is 400568004.

400865004 is a `hidden beast` number, since 4 + 0 + 0 + 8 + 650 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400865009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1855749 + ... + 1855964.

It is an arithmetic number, because the mean of its divisors is an integer number (43303330).

Almost surely, 2^400865004 is an apocalyptic number.

It is an amenable number.

400865004 is an abundant number, since it is smaller than the sum of its proper divisors (638414916).

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

400865004 is a wasteful number, since it uses less digits than its factorization.

400865004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711726 (or 3711718 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 400865004 is about 20021.6134215003. The cubic root of 400865004 is about 737.3370343358.

The spelling of 400865004 in words is "four hundred million, eight hundred sixty-five thousand, four".