30904 has 8 divisors (see below), whose sum is σ = 57960. Its totient is φ = 15448.

The previous prime is 30893. The next prime is 30911. The reversal of 30904 is 40903.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1924 + ... + 1939.

It is an arithmetic number, because the mean of its divisors is an integer number (7245).

2³⁰⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

30904 is a deficient number, since it is larger than the sum of its proper divisors (27056).

30904 is a wasteful number, since it uses less digits than its factorization.

30904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3869 (or 3865 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 30904 is about 175.7953355468. The cubic root of 30904 is about 31.3813458379.

Subtracting 30904 from its reverse (40903), we obtain a palindrome (9999).

The spelling of 30904 in words is "thirty thousand, nine hundred four".