30940720 has 40 divisors (see below), whose sum is σ = 72182880. Its totient is φ = 12334080.

The previous prime is 30940717. The next prime is 30940729. The reversal of 30940720 is 2704903.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (30940729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34680 + ... + 35560.

It is an arithmetic number, because the mean of its divisors is an integer number (1804572).

Almost surely, 2^30940720 is an apocalyptic number.

It is an amenable number.

30940720 is an abundant number, since it is smaller than the sum of its proper divisors (41242160).

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

30940720 is a wasteful number, since it uses less digits than its factorization.

30940720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 30940720 is about 5562.4383142647. The cubic root of 30940720 is about 313.9376997851.

The spelling of 30940720 in words is "thirty million, nine hundred forty thousand, seven hundred twenty".