18730865 has 16 divisors (see below), whose sum is σ = 24001920. Its totient is φ = 13991040.

The previous prime is 18730861. The next prime is 18730867. The reversal of 18730865 is 56803781.

It is not a de Polignac number, because 18730865 - 2² = 18730861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18730861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5357 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (1500120).

Almost surely, 2^18730865 is an apocalyptic number.

It is an amenable number.

18730865 is a deficient number, since it is larger than the sum of its proper divisors (5271055).

18730865 is a wasteful number, since it uses less digits than its factorization.

18730865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 18730865 is about 4327.9169354321. The cubic root of 18730865 is about 265.5742383276.

The spelling of 18730865 in words is "eighteen million, seven hundred thirty thousand, eight hundred sixty-five".