30912940 has 12 divisors (see below), whose sum is σ = 64917216. Its totient is φ = 12365168.

The previous prime is 30912911. The next prime is 30912941. The reversal of 30912940 is 4921903.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 30912899 and 30912908.

It is not an unprimeable number, because it can be changed into a prime (30912941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772804 + ... + 772843.

It is an arithmetic number, because the mean of its divisors is an integer number (5409768).

Almost surely, 2^30912940 is an apocalyptic number.

It is an amenable number.

30912940 is an abundant number, since it is smaller than the sum of its proper divisors (34004276).

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

30912940 is a wasteful number, since it uses less digits than its factorization.

30912940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545656 (or 1545654 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 30912940 is about 5559.9406471652. The cubic root of 30912940 is about 313.8437157548.

The spelling of 30912940 in words is "thirty million, nine hundred twelve thousand, nine hundred forty".