30904747 has 4 divisors (see below), whose sum is σ = 30926320. Its totient is φ = 30883176.

The previous prime is 30904733. The next prime is 30904751. The reversal of 30904747 is 74740903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74740903 = 223 ⋅335161.

It is a cyclic number.

It is not a de Polignac number, because 30904747 - 2⁷ = 30904619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30901747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8472 + ... + 11557.

It is an arithmetic number, because the mean of its divisors is an integer number (7731580).

Almost surely, 2^30904747 is an apocalyptic number.

30904747 is a deficient number, since it is larger than the sum of its proper divisors (21573).

30904747 is a wasteful number, since it uses less digits than its factorization.

30904747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21572.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 30904747 is about 5559.2038098994. The cubic root of 30904747 is about 313.8159868193.

The spelling of 30904747 in words is "thirty million, nine hundred four thousand, seven hundred forty-seven".