18018889 has 16 divisors (see below), whose sum is σ = 21888000. Its totient is φ = 14503104.

The previous prime is 18018883. The next prime is 18018901. The reversal of 18018889 is 98881081.

18018889 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 18018889 - 2⁷ = 18018761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18018883) 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 15 ways as a sum of consecutive naturals, for example, 6312 + ... + 8710.

It is an arithmetic number, because the mean of its divisors is an integer number (1368000).

Almost surely, 2^18018889 is an apocalyptic number.

It is an amenable number.

18018889 is a deficient number, since it is larger than the sum of its proper divisors (3869111).

18018889 is a wasteful number, since it uses less digits than its factorization.

18018889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472.

The product of its (nonzero) digits is 36864, while the sum is 43.

The square root of 18018889 is about 4244.8661934153. The cubic root of 18018889 is about 262.1657799362.

The spelling of 18018889 in words is "eighteen million, eighteen thousand, eight hundred eighty-nine".