18198307 has 2 divisors, whose sum is σ = 18198308. Its totient is φ = 18198306.

The previous prime is 18198293. The next prime is 18198317. The reversal of 18198307 is 70389181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18198307 - 2⁷ = 18198179 is a prime.

It is not a weakly prime, because it can be changed into another prime (18198317) 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, 9099153 + 9099154.

It is an arithmetic number, because the mean of its divisors is an integer number (9099154).

Almost surely, 2^18198307 is an apocalyptic number.

18198307 is a deficient number, since it is larger than the sum of its proper divisors (1).

18198307 is an equidigital number, since it uses as much as digits as its factorization.

18198307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 18198307 is about 4265.9473742652. The cubic root of 18198307 is about 263.0330549711.

The spelling of 18198307 in words is "eighteen million, one hundred ninety-eight thousand, three hundred seven".