400556 has 12 divisors (see below), whose sum is σ = 754992. Its totient is φ = 184848.

The previous prime is 400523. The next prime is 400559. The reversal of 400556 is 655004.

It is not an unprimeable number, because it can be changed into a prime (400559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3800 + ... + 3903.

It is an arithmetic number, because the mean of its divisors is an integer number (62916).

2⁴⁰⁰⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

400556 is a deficient number, since it is larger than the sum of its proper divisors (354436).

400556 is a wasteful number, since it uses less digits than its factorization.

400556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720 (or 7718 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 400556 is about 632.8949359886. The cubic root of 400556 is about 73.7147528593.

The spelling of 400556 in words is "four hundred thousand, five hundred fifty-six".