18238699 has 2 divisors, whose sum is σ = 18238700. Its totient is φ = 18238698.

The previous prime is 18238697. The next prime is 18238711. The reversal of 18238699 is 99683281.

It is a weak prime.

It is an emirp because it is prime and its reverse (99683281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18238699 - 2¹ = 18238697 is a prime.

Together with 18238697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18238691) 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, 9119349 + 9119350.

It is an arithmetic number, because the mean of its divisors is an integer number (9119350).

Almost surely, 2^18238699 is an apocalyptic number.

18238699 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238699 is an equidigital number, since it uses as much as digits as its factorization.

18238699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 18238699 is about 4270.6789858288. The cubic root of 18238699 is about 263.2275159239.

The spelling of 18238699 in words is "eighteen million, two hundred thirty-eight thousand, six hundred ninety-nine".