30809865 has 16 divisors (see below), whose sum is σ = 52195968. Its totient is φ = 15465216.

The previous prime is 30809851. The next prime is 30809873. The reversal of 30809865 is 56890803.

It is not a de Polignac number, because 30809865 - 2¹² = 30805769 is a prime.

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, 60157 + ... + 60666.

It is an arithmetic number, because the mean of its divisors is an integer number (3262248).

Almost surely, 2^30809865 is an apocalyptic number.

It is an amenable number.

30809865 is a deficient number, since it is larger than the sum of its proper divisors (21386103).

30809865 is a wasteful number, since it uses less digits than its factorization.

30809865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120848.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 30809865 is about 5550.6634738561. The cubic root of 30809865 is about 313.4945042521.

The spelling of 30809865 in words is "thirty million, eight hundred nine thousand, eight hundred sixty-five".