18400163 has 2 divisors, whose sum is σ = 18400164. Its totient is φ = 18400162.

The previous prime is 18400139. The next prime is 18400177. The reversal of 18400163 is 36100481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18400163 - 2⁸ = 18399907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18409163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9200081 + 9200082.

It is an arithmetic number, because the mean of its divisors is an integer number (9200082).

Almost surely, 2^18400163 is an apocalyptic number.

18400163 is a deficient number, since it is larger than the sum of its proper divisors (1).

18400163 is an equidigital number, since it uses as much as digits as its factorization.

18400163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18400163 is about 4289.5411176488. The cubic root of 18400163 is about 264.0020039257.

The spelling of 18400163 in words is "eighteen million, four hundred thousand, one hundred sixty-three".