30990975 has 24 divisors (see below), whose sum is σ = 51527952. Its totient is φ = 16435200.

The previous prime is 30990961. The next prime is 30990997. The reversal of 30990975 is 57909903.

It is a happy number.

It is not a de Polignac number, because 30990975 - 2⁵ = 30990943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13405 + ... + 15545.

It is an arithmetic number, because the mean of its divisors is an integer number (2146998).

Almost surely, 2^30990975 is an apocalyptic number.

30990975 is a deficient number, since it is larger than the sum of its proper divisors (20536977).

30990975 is a wasteful number, since it uses less digits than its factorization.

30990975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347 (or 2342 counting only the distinct ones).

The product of its (nonzero) digits is 76545, while the sum is 42.

The square root of 30990975 is about 5566.9538349083. The cubic root of 30990975 is about 314.1075773767.

The spelling of 30990975 in words is "thirty million, nine hundred ninety thousand, nine hundred seventy-five".