30918189 has 16 divisors (see below), whose sum is σ = 43763328. Its totient is φ = 19348992.

The previous prime is 30918163. The next prime is 30918197. The reversal of 30918189 is 98181903.

It is a happy number.

It is not a de Polignac number, because 30918189 - 2⁷ = 30918061 is a prime.

It is a super-2 number, since 2×30918189² = 1911868822079442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30918389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32529 + ... + 33465.

It is an arithmetic number, because the mean of its divisors is an integer number (2735208).

Almost surely, 2^30918189 is an apocalyptic number.

It is an amenable number.

30918189 is a deficient number, since it is larger than the sum of its proper divisors (12845139).

30918189 is a wasteful number, since it uses less digits than its factorization.

30918189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 30918189 is about 5560.4126645421. The cubic root of 30918189 is about 313.8614782456.

The spelling of 30918189 in words is "thirty million, nine hundred eighteen thousand, one hundred eighty-nine".