30908 has 6 divisors (see below), whose sum is σ = 54096. Its totient is φ = 15452.

The previous prime is 30893. The next prime is 30911. The reversal of 30908 is 80903.

It is an Ulam number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 30908.

It is a congruent number.

It is an unprimeable number.

30908 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 as a sum of consecutive naturals, namely, 3860 + ... + 3867.

It is an arithmetic number, because the mean of its divisors is an integer number (9016).

2³⁰⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

30908 is a deficient number, since it is larger than the sum of its proper divisors (23188).

30908 is a wasteful number, since it uses less digits than its factorization.

30908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7731 (or 7729 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 30908 is about 175.8067120448. The cubic root of 30908 is about 31.3826997076.

The spelling of 30908 in words is "thirty thousand, nine hundred eight".