18240618 has 16 divisors (see below), whose sum is σ = 39797856. Its totient is φ = 5527440.

The previous prime is 18240581. The next prime is 18240619. The reversal of 18240618 is 81604281.

It is not an unprimeable number, because it can be changed into a prime (18240619) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 138121 + ... + 138252.

It is an arithmetic number, because the mean of its divisors is an integer number (2487366).

Almost surely, 2^18240618 is an apocalyptic number.

18240618 is an abundant number, since it is smaller than the sum of its proper divisors (21557238).

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

18240618 is a wasteful number, since it uses less digits than its factorization.

18240618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276389.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18240618 is about 4270.9036514536. The cubic root of 18240618 is about 263.2367475014.

Adding to 18240618 its reverse (81604281), we get a palindrome (99844899).

The spelling of 18240618 in words is "eighteen million, two hundred forty thousand, six hundred eighteen".