305556 has 12 divisors (see below), whose sum is σ = 712992. Its totient is φ = 101848.

The previous prime is 305551. The next prime is 305563. The reversal of 305556 is 655503.

305556 is nontrivially palindromic in base 15.

305556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305551) by changing a digit.

305556 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 3 ways as a sum of consecutive naturals, for example, 12720 + ... + 12743.

It is an arithmetic number, because the mean of its divisors is an integer number (59416).

2³⁰⁵⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

305556 is an abundant number, since it is smaller than the sum of its proper divisors (407436).

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

305556 is a wasteful number, since it uses less digits than its factorization.

305556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25470 (or 25468 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 305556 is about 552.7712004075. The cubic root of 305556 is about 67.3540330002.

It can be divided in two parts, 305 and 556, that added together give a triangular number (861 = T₄₁).

The spelling of 305556 in words is "three hundred five thousand, five hundred fifty-six".