18461618 has 16 divisors (see below), whose sum is σ = 31726080. Its totient is φ = 7892736.

The previous prime is 18461593. The next prime is 18461621. The reversal of 18461618 is 81616481.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5330 + ... + 8082.

It is an arithmetic number, because the mean of its divisors is an integer number (1982880).

Almost surely, 2^18461618 is an apocalyptic number.

18461618 is a deficient number, since it is larger than the sum of its proper divisors (13264462).

18461618 is a wasteful number, since it uses less digits than its factorization.

18461618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241.

The product of its digits is 9216, while the sum is 35.

The square root of 18461618 is about 4296.6985000114. The cubic root of 18461618 is about 264.2955921592.

The spelling of 18461618 in words is "eighteen million, four hundred sixty-one thousand, six hundred eighteen".