18665120 has 24 divisors (see below), whose sum is σ = 44096724. Its totient is φ = 7465984.

The previous prime is 18665117. The next prime is 18665137. The reversal of 18665120 is 2156681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15085456 + 3579664 = 3884^2 + 1892^2 .

It is a super-2 number, since 2×18665120² = 696773409228800, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 58169 + ... + 58488.

Almost surely, 2^18665120 is an apocalyptic number.

18665120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18665120 is an abundant number, since it is smaller than the sum of its proper divisors (25431604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18665120 is a wasteful number, since it uses less digits than its factorization.

18665120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116672 (or 116664 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18665120 is about 4320.3148033448. The cubic root of 18665120 is about 265.2631538060.

The spelling of 18665120 in words is "eighteen million, six hundred sixty-five thousand, one hundred twenty".