400056 has 32 divisors (see below), whose sum is σ = 1017600. Its totient is φ = 131040.

The previous prime is 400051. The next prime is 400067. The reversal of 400056 is 650004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400051) by changing a digit.

400056 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 7 ways as a sum of consecutive naturals, for example, 1791 + ... + 2001.

It is an arithmetic number, because the mean of its divisors is an integer number (31800).

2⁴⁰⁰⁰⁵⁶ is an apocalyptic number.

It is a pronic number, being equal to 632×633.

It is an amenable number.

400056 is an abundant number, since it is smaller than the sum of its proper divisors (617544).

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

400056 is a wasteful number, since it uses less digits than its factorization.

400056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 400056 is about 632.4998023715. The cubic root of 400056 is about 73.6840682418.

The spelling of 400056 in words is "four hundred thousand, fifty-six".