18163907 has 2 divisors, whose sum is σ = 18163908. Its totient is φ = 18163906.

The previous prime is 18163891. The next prime is 18163913. The reversal of 18163907 is 70936181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18163907 - 2⁴ = 18163891 is a prime.

It is not a weakly prime, because it can be changed into another prime (18163987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9081953 + 9081954.

It is an arithmetic number, because the mean of its divisors is an integer number (9081954).

Almost surely, 2^18163907 is an apocalyptic number.

18163907 is a deficient number, since it is larger than the sum of its proper divisors (1).

18163907 is an equidigital number, since it uses as much as digits as its factorization.

18163907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 18163907 is about 4261.9135373679. The cubic root of 18163907 is about 262.8672145552.

The spelling of 18163907 in words is "eighteen million, one hundred sixty-three thousand, nine hundred seven".