18173339 has 2 divisors, whose sum is σ = 18173340. Its totient is φ = 18173338.

The previous prime is 18173317. The next prime is 18173341. The reversal of 18173339 is 93337181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18173339 is a prime.

It is a Sophie Germain prime.

Together with 18173341, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18173299 and 18173308.

It is not a weakly prime, because it can be changed into another prime (18173369) 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, 9086669 + 9086670.

It is an arithmetic number, because the mean of its divisors is an integer number (9086670).

Almost surely, 2^18173339 is an apocalyptic number.

18173339 is a deficient number, since it is larger than the sum of its proper divisors (1).

18173339 is an equidigital number, since it uses as much as digits as its factorization.

18173339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 18173339 is about 4263.0199389635. The cubic root of 18173339 is about 262.9127065032.

The spelling of 18173339 in words is "eighteen million, one hundred seventy-three thousand, three hundred thirty-nine".