18315489 has 4 divisors (see below), whose sum is σ = 24420656. Its totient is φ = 12210324.

The previous prime is 18315469. The next prime is 18315491. The reversal of 18315489 is 98451381.

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 not a de Polignac number, because 18315489 - 2¹³ = 18307297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18315469) 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 3 ways as a sum of consecutive naturals, for example, 3052579 + ... + 3052584.

It is an arithmetic number, because the mean of its divisors is an integer number (6105164).

Almost surely, 2^18315489 is an apocalyptic number.

It is an amenable number.

18315489 is a deficient number, since it is larger than the sum of its proper divisors (6105167).

18315489 is an equidigital number, since it uses as much as digits as its factorization.

18315489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105166.

The product of its digits is 34560, while the sum is 39.

The square root of 18315489 is about 4279.6599163952. The cubic root of 18315489 is about 263.5964190517.

The spelling of 18315489 in words is "eighteen million, three hundred fifteen thousand, four hundred eighty-nine".