18080865 has 24 divisors (see below), whose sum is σ = 34190208. Its totient is φ = 8766240.

The previous prime is 18080861. The next prime is 18080869. The reversal of 18080865 is 56808081.

It is an interprime number because it is at equal distance from previous prime (18080861) and next prime (18080869).

It is not a de Polignac number, because 18080865 - 2² = 18080861 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18080861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17769 + ... + 18758.

It is an arithmetic number, because the mean of its divisors is an integer number (1424592).

Almost surely, 2^18080865 is an apocalyptic number.

18080865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18080865 is a deficient number, since it is larger than the sum of its proper divisors (16109343).

18080865 is a wasteful number, since it uses less digits than its factorization.

18080865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36549 (or 36546 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 18080865 is about 4252.1600393212. The cubic root of 18080865 is about 262.4660092042.

The spelling of 18080865 in words is "eighteen million, eighty thousand, eight hundred sixty-five".