18686089 has 2 divisors, whose sum is σ = 18686090. Its totient is φ = 18686088.

The previous prime is 18686047. The next prime is 18686093. The reversal of 18686089 is 98068681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10188864 + 8497225 = 3192^2 + 2915^2 .

It is a cyclic number.

It is not a de Polignac number, because 18686089 - 2⁹ = 18685577 is a prime.

It is not a weakly prime, because it can be changed into another prime (18686989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343044 + 9343045.

It is an arithmetic number, because the mean of its divisors is an integer number (9343045).

Almost surely, 2^18686089 is an apocalyptic number.

It is an amenable number.

18686089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18686089 is an equidigital number, since it uses as much as digits as its factorization.

18686089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 18686089 is about 4322.7409128931. The cubic root of 18686089 is about 265.3624517017.

The spelling of 18686089 in words is "eighteen million, six hundred eighty-six thousand, eighty-nine".