18216323 has 2 divisors, whose sum is σ = 18216324. Its totient is φ = 18216322.

The previous prime is 18216311. The next prime is 18216343. The reversal of 18216323 is 32361281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18216323 - 2⁸ = 18216067 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 18216292 and 18216301.

It is not a weakly prime, because it can be changed into another prime (18216343) 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, 9108161 + 9108162.

It is an arithmetic number, because the mean of its divisors is an integer number (9108162).

Almost surely, 2^18216323 is an apocalyptic number.

18216323 is a deficient number, since it is larger than the sum of its proper divisors (1).

18216323 is an equidigital number, since it uses as much as digits as its factorization.

18216323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 18216323 is about 4268.0584578939. The cubic root of 18216323 is about 263.1198256910.

The spelling of 18216323 in words is "eighteen million, two hundred sixteen thousand, three hundred twenty-three".