18402618 has 32 divisors (see below), whose sum is σ = 39961152. Its totient is φ = 5616000.

The previous prime is 18402613. The next prime is 18402647. The reversal of 18402618 is 81620481.

It is not an unprimeable number, because it can be changed into a prime (18402611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9318 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (1248786).

Almost surely, 2^18402618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18402618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19980576).

18402618 is an abundant number, since it is smaller than the sum of its proper divisors (21558534).

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

18402618 is a wasteful number, since it uses less digits than its factorization.

18402618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950.

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

The square root of 18402618 is about 4289.8272692499. The cubic root of 18402618 is about 264.0137446930.

The spelling of 18402618 in words is "eighteen million, four hundred two thousand, six hundred eighteen".