18068309 has 12 divisors (see below), whose sum is σ = 21089088. Its totient is φ = 15435000.

The previous prime is 18068279. The next prime is 18068333. The reversal of 18068309 is 90386081.

It is not a de Polignac number, because 18068309 - 2²⁰ = 17019733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18068339) 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 in 11 ways as a sum of consecutive naturals, for example, 23684 + ... + 24434.

It is an arithmetic number, because the mean of its divisors is an integer number (1757424).

Almost surely, 2^18068309 is an apocalyptic number.

It is an amenable number.

18068309 is a deficient number, since it is larger than the sum of its proper divisors (3020779).

18068309 is an equidigital number, since it uses as much as digits as its factorization.

18068309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256 (or 1249 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18068309 is about 4250.6833568263. The cubic root of 18068309 is about 262.4052398706.

The spelling of 18068309 in words is "eighteen million, sixty-eight thousand, three hundred nine".