18116889 has 16 divisors (see below), whose sum is σ = 28250112. Its totient is φ = 10111248.

The previous prime is 18116873. The next prime is 18116911. The reversal of 18116889 is 98861181.

It is not a de Polignac number, because 18116889 - 2⁴ = 18116873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18116889.

It is not an unprimeable number, because it can be changed into a prime (18116809) 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, 9129 + ... + 10934.

It is an arithmetic number, because the mean of its divisors is an integer number (1765632).

Almost surely, 2^18116889 is an apocalyptic number.

It is an amenable number.

18116889 is a deficient number, since it is larger than the sum of its proper divisors (10133223).

18116889 is a wasteful number, since it uses less digits than its factorization.

18116889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20116.

The product of its digits is 27648, while the sum is 42.

The square root of 18116889 is about 4256.3938962460. The cubic root of 18116889 is about 262.6402044668.

The spelling of 18116889 in words is "eighteen million, one hundred sixteen thousand, eight hundred eighty-nine".