405604 has 12 divisors (see below), whose sum is σ = 732928. Its totient is φ = 196200.

The previous prime is 405599. The next prime is 405607. The reversal of 405604 is 406504.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (405607) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1512 + ... + 1759.

2⁴⁰⁵⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

405604 is a deficient number, since it is larger than the sum of its proper divisors (327324).

405604 is a wasteful number, since it uses less digits than its factorization.

405604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306 (or 3304 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 405604 is about 636.8704734873. The cubic root of 405604 is about 74.0231240126.

Subtracting 405604 from its reverse (406504), we obtain a square (900 = 30²).

The spelling of 405604 in words is "four hundred five thousand, six hundred four".