18311889 has 8 divisors (see below), whose sum is σ = 24829920. Its totient is φ = 12000896.

The previous prime is 18311861. The next prime is 18311893. The reversal of 18311889 is 98811381.

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

It is a cyclic number.

It is not a de Polignac number, because 18311889 - 2⁵ = 18311857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18311819) 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 7 ways as a sum of consecutive naturals, for example, 51552 + ... + 51905.

It is an arithmetic number, because the mean of its divisors is an integer number (3103740).

Almost surely, 2^18311889 is an apocalyptic number.

It is an amenable number.

18311889 is a deficient number, since it is larger than the sum of its proper divisors (6518031).

18311889 is a wasteful number, since it uses less digits than its factorization.

18311889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103519.

The product of its digits is 13824, while the sum is 39.

The square root of 18311889 is about 4279.2393015582. The cubic root of 18311889 is about 263.5791475265.

The spelling of 18311889 in words is "eighteen million, three hundred eleven thousand, eight hundred eighty-nine".