18089789 has 2 divisors, whose sum is σ = 18089790. Its totient is φ = 18089788.

The previous prime is 18089737. The next prime is 18089791. The reversal of 18089789 is 98798081.

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., 9504889 + 8584900 = 3083^2 + 2930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18089789 is a prime.

It is a Sophie Germain prime.

Together with 18089791, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18083789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9044894 + 9044895.

It is an arithmetic number, because the mean of its divisors is an integer number (9044895).

Almost surely, 2^18089789 is an apocalyptic number.

It is an amenable number.

18089789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18089789 is an equidigital number, since it uses as much as digits as its factorization.

18089789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 18089789 is about 4253.2092589009. The cubic root of 18089789 is about 262.5091830499.

The spelling of 18089789 in words is "eighteen million, eighty-nine thousand, seven hundred eighty-nine".