404865 has 16 divisors (see below), whose sum is σ = 720000. Its totient is φ = 215856.

The previous prime is 404851. The next prime is 404941. The reversal of 404865 is 568404.

It is not a de Polignac number, because 404865 - 2⁴ = 404849 is a prime.

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

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, 1365 + ... + 1634.

It is an arithmetic number, because the mean of its divisors is an integer number (45000).

2⁴⁰⁴⁸⁶⁵ is an apocalyptic number.

404865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

404865 is a deficient number, since it is larger than the sum of its proper divisors (315135).

404865 is a wasteful number, since it uses less digits than its factorization.

404865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013 (or 3007 counting only the distinct ones).

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

The square root of 404865 is about 636.2900282104. The cubic root of 404865 is about 73.9781406094.

The spelling of 404865 in words is "four hundred four thousand, eight hundred sixty-five".