865006404 has 48 divisors (see below), whose sum is σ = 2084721408. Its totient is φ = 278980128.

The previous prime is 865006399. The next prime is 865006411. The reversal of 865006404 is 404600568.

It is a happy number.

It is a super-2 number, since 2×865006404² = 1496472157922022432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47379 + ... + 63045.

It is an arithmetic number, because the mean of its divisors is an integer number (43431696).

Almost surely, 2^865006404 is an apocalyptic number.

It is an amenable number.

865006404 is an abundant number, since it is smaller than the sum of its proper divisors (1219715004).

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

865006404 is a wasteful number, since it uses less digits than its factorization.

865006404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15824 (or 15822 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 865006404 is about 29410.9912107702. The cubic root of 865006404 is about 952.8102948099.

The spelling of 865006404 in words is "eight hundred sixty-five million, six thousand, four hundred four".