18431089 has 8 divisors (see below), whose sum is σ = 18802368. Its totient is φ = 18062160.

The previous prime is 18431059. The next prime is 18431131. The reversal of 18431089 is 98013481.

It is a happy number.

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 18431089 - 2¹⁷ = 18300017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18431059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28164 + ... + 28810.

It is an arithmetic number, because the mean of its divisors is an integer number (2350296).

Almost surely, 2^18431089 is an apocalyptic number.

It is an amenable number.

18431089 is a deficient number, since it is larger than the sum of its proper divisors (371279).

18431089 is an equidigital number, since it uses as much as digits as its factorization.

18431089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18431089 is about 4293.1444187216. The cubic root of 18431089 is about 264.1498279074.

The spelling of 18431089 in words is "eighteen million, four hundred thirty-one thousand, eighty-nine".