404004865 has 32 divisors (see below), whose sum is σ = 549015552. Its totient is φ = 282744000.

The previous prime is 404004833. The next prime is 404004877. The reversal of 404004865 is 568400404.

It is not a de Polignac number, because 404004865 - 2⁵ = 404004833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 359194 + ... + 360316.

It is an arithmetic number, because the mean of its divisors is an integer number (17156736).

Almost surely, 2^404004865 is an apocalyptic number.

404004865 is the 11605-th octagonal number.

It is an amenable number.

404004865 is a deficient number, since it is larger than the sum of its proper divisors (145010687).

404004865 is a wasteful number, since it uses less digits than its factorization.

404004865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 404004865 is about 20099.8722632757. The cubic root of 404004865 is about 739.2571465453.

The spelling of 404004865 in words is "four hundred four million, four thousand, eight hundred sixty-five".