30943872 has 48 divisors (see below), whose sum is σ = 89047530. Its totient is φ = 10314240.

The previous prime is 30943853. The next prime is 30943919. The reversal of 30943872 is 27834903.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 207936 = 5544^2 + 456^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12279 + ... + 14582.

Almost surely, 2^30943872 is an apocalyptic number.

30943872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

30943872 is an abundant number, since it is smaller than the sum of its proper divisors (58103658).

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

30943872 is a wasteful number, since it uses less digits than its factorization.

30943872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26881 (or 26866 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 30943872 is about 5562.7216360339. The cubic root of 30943872 is about 313.9483599338.

The spelling of 30943872 in words is "thirty million, nine hundred forty-three thousand, eight hundred seventy-two".