18086899 has 2 divisors, whose sum is σ = 18086900. Its totient is φ = 18086898.

The previous prime is 18086897. The next prime is 18086933. The reversal of 18086899 is 99868081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18086899 - 2¹ = 18086897 is a prime.

Together with 18086897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18086891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043449 + 9043450.

It is an arithmetic number, because the mean of its divisors is an integer number (9043450).

Almost surely, 2^18086899 is an apocalyptic number.

18086899 is a deficient number, since it is larger than the sum of its proper divisors (1).

18086899 is an equidigital number, since it uses as much as digits as its factorization.

18086899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 18086899 is about 4252.8695018775. The cubic root of 18086899 is about 262.4952029358.

The spelling of 18086899 in words is "eighteen million, eighty-six thousand, eight hundred ninety-nine".