30467921 has 10 divisors (see below), whose sum is σ = 33530610. Its totient is φ = 27684800.

The previous prime is 30467903. The next prime is 30467923. The reversal of 30467921 is 12976403.

It can be written as a sum of positive squares in only one way, i.e., 24611521 + 5856400 = 4961^2 + 2420^2 .

It is not a de Polignac number, because 30467921 - 2¹⁰ = 30466897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30467923) 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 9 ways as a sum of consecutive naturals, for example, 13601 + ... + 15681.

It is an arithmetic number, because the mean of its divisors is an integer number (3353061).

Almost surely, 2^30467921 is an apocalyptic number.

It is an amenable number.

30467921 is a deficient number, since it is larger than the sum of its proper divisors (3062689).

30467921 is an frugal number, since it uses more digits than its factorization.

30467921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125 (or 2092 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 30467921 is about 5519.7754483312. The cubic root of 30467921 is about 312.3304116640.

The spelling of 30467921 in words is "thirty million, four hundred sixty-seven thousand, nine hundred twenty-one".