405804 has 24 divisors (see below), whose sum is σ = 1082368. Its totient is φ = 115920.

The previous prime is 405799. The next prime is 405817. The reversal of 405804 is 408504.

405804 = T₃₃₇ + T₃₃₈ + ... + T₃₄₃.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2332 + ... + 2499.

2⁴⁰⁵⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

405804 is an abundant number, since it is smaller than the sum of its proper divisors (676564).

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

405804 is a wasteful number, since it uses less digits than its factorization.

405804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4845 (or 4843 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 405804 is about 637.0274719351. The cubic root of 405804 is about 74.0352887449.

The spelling of 405804 in words is "four hundred five thousand, eight hundred four".