18008418 has 16 divisors (see below), whose sum is σ = 36990720. Its totient is φ = 5840496.

The previous prime is 18008413. The next prime is 18008467. The reversal of 18008418 is 81480081.

It is not an unprimeable number, because it can be changed into a prime (18008413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40338 + ... + 40781.

It is an arithmetic number, because the mean of its divisors is an integer number (2311920).

Almost surely, 2^18008418 is an apocalyptic number.

18008418 is an abundant number, since it is smaller than the sum of its proper divisors (18982302).

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

18008418 is a wasteful number, since it uses less digits than its factorization.

18008418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81161.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 18008418 is about 4243.6326419708. The cubic root of 18008418 is about 262.1149875002.

Adding to 18008418 its reverse (81480081), we get a palindrome (99488499).

The spelling of 18008418 in words is "eighteen million, eight thousand, four hundred eighteen".