18358989 has 16 divisors (see below), whose sum is σ = 27073344. Its totient is φ = 10972800.

The previous prime is 18358973. The next prime is 18359023. The reversal of 18358989 is 98985381.

It is not a de Polignac number, because 18358989 - 2⁴ = 18358973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18358909) 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, 1402 + ... + 6219.

It is an arithmetic number, because the mean of its divisors is an integer number (1692084).

Almost surely, 2^18358989 is an apocalyptic number.

It is an amenable number.

18358989 is a deficient number, since it is larger than the sum of its proper divisors (8714355).

18358989 is a wasteful number, since it uses less digits than its factorization.

18358989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7708.

The product of its digits is 622080, while the sum is 51.

The square root of 18358989 is about 4284.7390819045. The cubic root of 18358989 is about 263.8049379805.

The spelling of 18358989 in words is "eighteen million, three hundred fifty-eight thousand, nine hundred eighty-nine".