18085218 has 8 divisors (see below), whose sum is σ = 36170448. Its totient is φ = 6028404.

The previous prime is 18085213. The next prime is 18085237. The reversal of 18085218 is 81258081.

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

18085218 is an admirable number.

It is a super-2 number, since 2×18085218² = 654150220215048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18085213) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1507096 + ... + 1507107.

It is an arithmetic number, because the mean of its divisors is an integer number (4521306).

Almost surely, 2^18085218 is an apocalyptic number.

18085218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18085218 is a wasteful number, since it uses less digits than its factorization.

18085218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014208.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 18085218 is about 4252.6718660155. The cubic root of 18085218 is about 262.4870705650.

The spelling of 18085218 in words is "eighteen million, eighty-five thousand, two hundred eighteen".