30328921 has 16 divisors (see below), whose sum is σ = 36736000. Its totient is φ = 24459408.

The previous prime is 30328919. The next prime is 30328931. The reversal of 30328921 is 12982303.

30328921 = 160³ + 161³ + ... + 166³.

It is a cyclic number.

It is not a de Polignac number, because 30328921 - 2¹ = 30328919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30328921.

It is not an unprimeable number, because it can be changed into a prime (30328931) by changing a digit.

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, 20980 + ... + 22378.

It is an arithmetic number, because the mean of its divisors is an integer number (2296000).

Almost surely, 2^30328921 is an apocalyptic number.

It is an amenable number.

30328921 is a deficient number, since it is larger than the sum of its proper divisors (6407079).

30328921 is a wasteful number, since it uses less digits than its factorization.

30328921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 30328921 is about 5507.1699628757. The cubic root of 30328921 is about 311.8547188228.

The spelling of 30328921 in words is "thirty million, three hundred twenty-eight thousand, nine hundred twenty-one".