42556 has 6 divisors (see below), whose sum is σ = 74480. Its totient is φ = 21276.

The previous prime is 42533. The next prime is 42557. The reversal of 42556 is 65524.

42556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×42556² = 3622026272, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5316 + ... + 5323.

2⁴²⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

42556 is a deficient number, since it is larger than the sum of its proper divisors (31924).

42556 is a wasteful number, since it uses less digits than its factorization.

42556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643 (or 10641 counting only the distinct ones).

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

The square root of 42556 is about 206.2910565197. The cubic root of 42556 is about 34.9129811071.

The spelling of 42556 in words is "forty-two thousand, five hundred fifty-six".