18026181 has 12 divisors (see below), whose sum is σ = 27170208. Its totient is φ = 11494824.

The previous prime is 18026179. The next prime is 18026213. The reversal of 18026181 is 18162081.

It is not a de Polignac number, because 18026181 - 2¹ = 18026179 is a prime.

It is a super-2 number, since 2×18026181² = 649886402889522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18026161) 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 11 ways as a sum of consecutive naturals, for example, 43335 + ... + 43748.

It is an arithmetic number, because the mean of its divisors is an integer number (2264184).

Almost surely, 2^18026181 is an apocalyptic number.

It is an amenable number.

18026181 is a deficient number, since it is larger than the sum of its proper divisors (9144027).

18026181 is a wasteful number, since it uses less digits than its factorization.

18026181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87112 (or 87109 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 18026181 is about 4245.7250264236. The cubic root of 18026181 is about 262.2011401452.

The spelling of 18026181 in words is "eighteen million, twenty-six thousand, one hundred eighty-one".