30945972 has 48 divisors (see below), whose sum is σ = 74289600. Its totient is φ = 10022400.

The previous prime is 30945961. The next prime is 30945973. The reversal of 30945972 is 27954903.

It is a self number, because there is not a number n which added to its sum of digits gives 30945972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30945973) 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, 76972 + ... + 77372.

It is an arithmetic number, because the mean of its divisors is an integer number (1547700).

Almost surely, 2^30945972 is an apocalyptic number.

It is an amenable number.

30945972 is an abundant number, since it is smaller than the sum of its proper divisors (43343628).

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

30945972 is a wasteful number, since it uses less digits than its factorization.

30945972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 30945972 is about 5562.9103893556. The cubic root of 30945972 is about 313.9554617885.

The spelling of 30945972 in words is "thirty million, nine hundred forty-five thousand, nine hundred seventy-two".