18388207 has 2 divisors, whose sum is σ = 18388208. Its totient is φ = 18388206.

The previous prime is 18388199. The next prime is 18388229. The reversal of 18388207 is 70288381.

It is a weak prime.

It is an emirp because it is prime and its reverse (70288381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18388207 - 2³ = 18388199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18388807) 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, 9194103 + 9194104.

It is an arithmetic number, because the mean of its divisors is an integer number (9194104).

Almost surely, 2^18388207 is an apocalyptic number.

18388207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18388207 is an equidigital number, since it uses as much as digits as its factorization.

18388207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 18388207 is about 4288.1472689263. The cubic root of 18388207 is about 263.9448107393.

The spelling of 18388207 in words is "eighteen million, three hundred eighty-eight thousand, two hundred seven".