18986699 has 2 divisors, whose sum is σ = 18986700. Its totient is φ = 18986698.

The previous prime is 18986689. The next prime is 18986767. The reversal of 18986699 is 99668981.

It is a weak prime.

It is an emirp because it is prime and its reverse (99668981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18986699 - 2²⁴ = 2209483 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18986689) 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, 9493349 + 9493350.

It is an arithmetic number, because the mean of its divisors is an integer number (9493350).

Almost surely, 2^18986699 is an apocalyptic number.

18986699 is a deficient number, since it is larger than the sum of its proper divisors (1).

18986699 is an equidigital number, since it uses as much as digits as its factorization.

18986699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 56.

The square root of 18986699 is about 4357.3729470864. The cubic root of 18986699 is about 266.7778829498. Note that the first 3 decimals are identical.

The spelling of 18986699 in words is "eighteen million, nine hundred eighty-six thousand, six hundred ninety-nine".