18204089 has 2 divisors, whose sum is σ = 18204090. Its totient is φ = 18204088.

The previous prime is 18204079. The next prime is 18204091. The reversal of 18204089 is 98040281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16949689 + 1254400 = 4117^2 + 1120^2 .

It is an emirp because it is prime and its reverse (98040281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18204089 - 2²⁰ = 17155513 is a prime.

It is a Sophie Germain prime.

Together with 18204091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18204029) 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 as a sum of consecutive naturals, namely, 9102044 + 9102045.

It is an arithmetic number, because the mean of its divisors is an integer number (9102045).

Almost surely, 2^18204089 is an apocalyptic number.

It is an amenable number.

18204089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18204089 is an equidigital number, since it uses as much as digits as its factorization.

18204089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18204089 is about 4266.6250128175. The cubic root of 18204089 is about 263.0609091387.

The spelling of 18204089 in words is "eighteen million, two hundred four thousand, eighty-nine".