18320089 has 4 divisors (see below), whose sum is σ = 18342324. Its totient is φ = 18297856.

The previous prime is 18320063. The next prime is 18320111. The reversal of 18320089 is 98002381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98002381 = 37 ⋅2648713.

It can be written as a sum of positive squares in 2 ways, for example, as 9048064 + 9272025 = 3008^2 + 3045^2 .

It is a cyclic number.

It is not a de Polignac number, because 18320089 - 2¹⁹ = 17795801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18320089.

It is not an unprimeable number, because it can be changed into a prime (18320189) 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, 9832 + ... + 11545.

It is an arithmetic number, because the mean of its divisors is an integer number (4585581).

Almost surely, 2^18320089 is an apocalyptic number.

It is an amenable number.

18320089 is a deficient number, since it is larger than the sum of its proper divisors (22235).

18320089 is an equidigital number, since it uses as much as digits as its factorization.

18320089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22234.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18320089 is about 4280.1973085361. The cubic root of 18320089 is about 263.6184849296.

The spelling of 18320089 in words is "eighteen million, three hundred twenty thousand, eighty-nine".