18969618 has 32 divisors (see below), whose sum is σ = 40010112. Its totient is φ = 5984000.

The previous prime is 18969583. The next prime is 18969647. The reversal of 18969618 is 81696981.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13258 + ... + 14618.

It is an arithmetic number, because the mean of its divisors is an integer number (1250316).

Almost surely, 2^18969618 is an apocalyptic number.

18969618 is an abundant number, since it is smaller than the sum of its proper divisors (21040494).

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

18969618 is a wasteful number, since it uses less digits than its factorization.

18969618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490.

The product of its digits is 186624, while the sum is 48.

The square root of 18969618 is about 4355.4124948161. The cubic root of 18969618 is about 266.6978585041.

The spelling of 18969618 in words is "eighteen million, nine hundred sixty-nine thousand, six hundred eighteen".