30721434 has 32 divisors (see below), whose sum is σ = 63744000. Its totient is φ = 9860400.

The previous prime is 30721429. The next prime is 30721447. The reversal of 30721434 is 43412703.

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

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 15 ways as a sum of consecutive naturals, for example, 61317 + ... + 61815.

It is an arithmetic number, because the mean of its divisors is an integer number (1992000).

Almost surely, 2^30721434 is an apocalyptic number.

30721434 is an abundant number, since it is smaller than the sum of its proper divisors (33022566).

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

30721434 is a wasteful number, since it uses less digits than its factorization.

30721434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 30721434 is about 5542.6919452555. The cubic root of 30721434 is about 313.1942844123.

The spelling of 30721434 in words is "thirty million, seven hundred twenty-one thousand, four hundred thirty-four".