18708089 has 2 divisors, whose sum is σ = 18708090. Its totient is φ = 18708088.

The previous prime is 18708023. The next prime is 18708091. The reversal of 18708089 is 98080781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 218089 = 4300^2 + 467^2 .

It is an emirp because it is prime and its reverse (98080781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18708089 is a prime.

Together with 18708091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18708289) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354044 + 9354045.

It is an arithmetic number, because the mean of its divisors is an integer number (9354045).

Almost surely, 2^18708089 is an apocalyptic number.

It is an amenable number.

18708089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18708089 is an equidigital number, since it uses as much as digits as its factorization.

18708089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 18708089 is about 4325.2848461113. The cubic root of 18708089 is about 265.4665520359.

The spelling of 18708089 in words is "eighteen million, seven hundred eight thousand, eighty-nine".