18955207 has 2 divisors, whose sum is σ = 18955208. Its totient is φ = 18955206.

The previous prime is 18955169. The next prime is 18955213. The reversal of 18955207 is 70255981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18955207 - 2¹¹ = 18953159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18955247) 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, 9477603 + 9477604.

It is an arithmetic number, because the mean of its divisors is an integer number (9477604).

Almost surely, 2^18955207 is an apocalyptic number.

18955207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18955207 is an equidigital number, since it uses as much as digits as its factorization.

18955207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 18955207 is about 4353.7578021750. The cubic root of 18955207 is about 266.6303056325.

The spelling of 18955207 in words is "eighteen million, nine hundred fifty-five thousand, two hundred seven".