30539721 has 4 divisors (see below), whose sum is σ = 40719632. Its totient is φ = 20359812.

The previous prime is 30539693. The next prime is 30539731. The reversal of 30539721 is 12793503.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 30539721 - 2⁶ = 30539657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30539731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5089951 + ... + 5089956.

It is an arithmetic number, because the mean of its divisors is an integer number (10179908).

Almost surely, 2^30539721 is an apocalyptic number.

It is an amenable number.

30539721 is a deficient number, since it is larger than the sum of its proper divisors (10179911).

30539721 is a wasteful number, since it uses less digits than its factorization.

30539721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10179910.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 30539721 is about 5526.2755088758. The cubic root of 30539721 is about 312.5755627407.

The spelling of 30539721 in words is "thirty million, five hundred thirty-nine thousand, seven hundred twenty-one".