18418618 has 8 divisors (see below), whose sum is σ = 27788148. Its totient is φ = 9155904.

The previous prime is 18418591. The next prime is 18418627. The reversal of 18418618 is 81681481.

It can be written as a sum of positive squares in 2 ways, for example, as 18344089 + 74529 = 4283^2 + 273^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26271 + ... + 26962.

Almost surely, 2^18418618 is an apocalyptic number.

18418618 is a deficient number, since it is larger than the sum of its proper divisors (9369530).

18418618 is a wasteful number, since it uses less digits than its factorization.

18418618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53408.

The product of its digits is 12288, while the sum is 37.

The square root of 18418618 is about 4291.6917410271. The cubic root of 18418618 is about 264.0902373650.

The spelling of 18418618 in words is "eighteen million, four hundred eighteen thousand, six hundred eighteen".