18518207 has 2 divisors, whose sum is σ = 18518208. Its totient is φ = 18518206.

The previous prime is 18518161. The next prime is 18518209. The reversal of 18518207 is 70281581.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (70281581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18518207 is a prime.

Together with 18518209, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18518209) 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, 9259103 + 9259104.

It is an arithmetic number, because the mean of its divisors is an integer number (9259104).

Almost surely, 2^18518207 is an apocalyptic number.

18518207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518207 is an equidigital number, since it uses as much as digits as its factorization.

18518207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 18518207 is about 4303.2786337861. The cubic root of 18518207 is about 264.5653584719.

Adding to 18518207 its reverse (70281581), we get a palindrome (88799788).

The spelling of 18518207 in words is "eighteen million, five hundred eighteen thousand, two hundred seven".