555904 has 32 divisors (see below), whose sum is σ = 1144440. Its totient is φ = 268800.

The previous prime is 555871. The next prime is 555931. The reversal of 555904 is 409555.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5454 + ... + 5554.

2⁵⁵⁵⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 555904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (572220).

555904 is an abundant number, since it is smaller than the sum of its proper divisors (588536).

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

555904 is a wasteful number, since it uses less digits than its factorization.

555904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 555904 is about 745.5896994997. The cubic root of 555904 is about 82.2242523103.

The spelling of 555904 in words is "five hundred fifty-five thousand, nine hundred four".