18108189 has 24 divisors (see below), whose sum is σ = 28832544. Its totient is φ = 10860000.

The previous prime is 18108173. The next prime is 18108217. The reversal of 18108189 is 98180181.

It is not a de Polignac number, because 18108189 - 2⁴ = 18108173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18108109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9094 + ... + 10904.

It is an arithmetic number, because the mean of its divisors is an integer number (1201356).

Almost surely, 2^18108189 is an apocalyptic number.

It is an amenable number.

18108189 is a deficient number, since it is larger than the sum of its proper divisors (10724355).

18108189 is a wasteful number, since it uses less digits than its factorization.

18108189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929 (or 1926 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 18108189 is about 4255.3717816426. The cubic root of 18108189 is about 262.5981564891.

It can be divided in two parts, 1810 and 8189, that added together give a palindrome (9999).

The spelling of 18108189 in words is "eighteen million, one hundred eight thousand, one hundred eighty-nine".