404556 has 12 divisors (see below), whose sum is σ = 943992. Its totient is φ = 134848.

The previous prime is 404539. The next prime is 404557. The reversal of 404556 is 655404.

404556 = 208² + 209² + ... + 216².

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 404556.

It is not an unprimeable number, because it can be changed into a prime (404557) by changing a digit.

404556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16845 + ... + 16868.

It is an arithmetic number, because the mean of its divisors is an integer number (78666).

2⁴⁰⁴⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

404556 is an abundant number, since it is smaller than the sum of its proper divisors (539436).

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

404556 is a wasteful number, since it uses less digits than its factorization.

404556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33720 (or 33718 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 404556 is about 636.0471680622. The cubic root of 404556 is about 73.9593153521.

The spelling of 404556 in words is "four hundred four thousand, five hundred fifty-six".