18123089 has 4 divisors (see below), whose sum is σ = 18430320. Its totient is φ = 17815860.

The previous prime is 18123073. The next prime is 18123097. The reversal of 18123089 is 98032181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18123089 - 2⁴ = 18123073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18123689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153527 + ... + 153644.

It is an arithmetic number, because the mean of its divisors is an integer number (4607580).

Almost surely, 2^18123089 is an apocalyptic number.

It is an amenable number.

18123089 is a deficient number, since it is larger than the sum of its proper divisors (307231).

18123089 is an equidigital number, since it uses as much as digits as its factorization.

18123089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307230.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18123089 is about 4257.1221499976. The cubic root of 18123089 is about 262.6701614782.

The spelling of 18123089 in words is "eighteen million, one hundred twenty-three thousand, eighty-nine".