402556 has 24 divisors (see below), whose sum is σ = 878976. Its totient is φ = 156720.

The previous prime is 402551. The next prime is 402559. The reversal of 402556 is 655204.

402556 = T₂₅₃ + T₂₅₄ + ... + T₂₆₄.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346 + ... + 961.

It is an arithmetic number, because the mean of its divisors is an integer number (36624).

2⁴⁰²⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

402556 is an abundant number, since it is smaller than the sum of its proper divisors (476420).

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

402556 is a wasteful number, since it uses less digits than its factorization.

402556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 402556 is about 634.4730096702. The cubic root of 402556 is about 73.8372366147.

The spelling of 402556 in words is "four hundred two thousand, five hundred fifty-six".