18480865 has 32 divisors (see below), whose sum is σ = 24998400. Its totient is φ = 13029120.

The previous prime is 18480851. The next prime is 18480881. The reversal of 18480865 is 56808481.

It is a de Polignac number, because none of the positive numbers 2^k-18480865 is a prime.

It is a super-2 number, since 2×18480865² = 683084742296450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233896 + ... + 233974.

It is an arithmetic number, because the mean of its divisors is an integer number (781200).

Almost surely, 2^18480865 is an apocalyptic number.

It is an amenable number.

18480865 is a deficient number, since it is larger than the sum of its proper divisors (6517535).

18480865 is a wasteful number, since it uses less digits than its factorization.

18480865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 18480865 is about 4298.9376594689. The cubic root of 18480865 is about 264.3874066203.

The spelling of 18480865 in words is "eighteen million, four hundred eighty thousand, eight hundred sixty-five".