18945618 has 8 divisors (see below), whose sum is σ = 37891248. Its totient is φ = 6315204.

The previous prime is 18945611. The next prime is 18945637. The reversal of 18945618 is 81654981.

It is a sphenic number, since it is the product of 3 distinct primes.

18945618 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18945618.

It is not an unprimeable number, because it can be changed into a prime (18945611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1578796 + ... + 1578807.

It is an arithmetic number, because the mean of its divisors is an integer number (4736406).

Almost surely, 2^18945618 is an apocalyptic number.

18945618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18945618 is a wasteful number, since it uses less digits than its factorization.

18945618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157608.

The product of its digits is 69120, while the sum is 42.

The square root of 18945618 is about 4352.6564302734. The cubic root of 18945618 is about 266.5853373511.

The spelling of 18945618 in words is "eighteen million, nine hundred forty-five thousand, six hundred eighteen".