404656 has 20 divisors (see below), whose sum is σ = 896272. Its totient is φ = 173376.

The previous prime is 404597. The next prime is 404671. The reversal of 404656 is 656404.

It is a happy number.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 404656.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1695 + ... + 1918.

2⁴⁰⁴⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

404656 is an abundant number, since it is smaller than the sum of its proper divisors (491616).

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

404656 is a wasteful number, since it uses less digits than its factorization.

404656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628 (or 3622 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 404656 is about 636.1257737272. The cubic root of 404656 is about 73.9654087172.

It can be divided in two parts, 4046 and 56, that multiplied together give a square (226576 = 476²).

The spelling of 404656 in words is "four hundred four thousand, six hundred fifty-six".