30947812 has 18 divisors (see below), whose sum is σ = 63001302. Its totient is φ = 13263264.

The previous prime is 30947783. The next prime is 30947821. The reversal of 30947812 is 21874903.

It can be written as a sum of positive squares in only one way, i.e., 22791076 + 8156736 = 4774^2 + 2856^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78753 + ... + 79144.

Almost surely, 2^30947812 is an apocalyptic number.

It is an amenable number.

30947812 is an abundant number, since it is smaller than the sum of its proper divisors (32053490).

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

30947812 is a wasteful number, since it uses less digits than its factorization.

30947812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157915 (or 157906 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 30947812 is about 5563.0757679543. The cubic root of 30947812 is about 313.9616841018.

The spelling of 30947812 in words is "thirty million, nine hundred forty-seven thousand, eight hundred twelve".