18384319 has 2 divisors, whose sum is σ = 18384320. Its totient is φ = 18384318.

The previous prime is 18384307. The next prime is 18384329. The reversal of 18384319 is 91348381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18384319 is a prime.

It is a super-2 number, since 2×18384319² = 675966370187522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18384329) 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, 9192159 + 9192160.

It is an arithmetic number, because the mean of its divisors is an integer number (9192160).

Almost surely, 2^18384319 is an apocalyptic number.

18384319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18384319 is an equidigital number, since it uses as much as digits as its factorization.

18384319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 18384319 is about 4287.6939023209. The cubic root of 18384319 is about 263.9262066096.

The spelling of 18384319 in words is "eighteen million, three hundred eighty-four thousand, three hundred nineteen".