18378618 has 32 divisors (see below), whose sum is σ = 37713600. Its totient is φ = 5968896.

The previous prime is 18378617. The next prime is 18378623. The reversal of 18378618 is 81687381.

It is a self number, because there is not a number n which added to its sum of digits gives 18378618.

It is not an unprimeable number, because it can be changed into a prime (18378611) 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, 68188 + ... + 68456.

It is an arithmetic number, because the mean of its divisors is an integer number (1178550).

Almost surely, 2^18378618 is an apocalyptic number.

18378618 is an abundant number, since it is smaller than the sum of its proper divisors (19334982).

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

18378618 is a wasteful number, since it uses less digits than its factorization.

18378618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526.

The product of its digits is 64512, while the sum is 42.

The square root of 18378618 is about 4287.0290411892. The cubic root of 18378618 is about 263.8989225084.

The spelling of 18378618 in words is "eighteen million, three hundred seventy-eight thousand, six hundred eighteen".