18316309 has 8 divisors (see below), whose sum is σ = 20053152. Its totient is φ = 16591440.

The previous prime is 18316307. The next prime is 18316339. The reversal of 18316309 is 90361381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18316309 - 2¹ = 18316307 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 (18316301) 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 7 ways as a sum of consecutive naturals, for example, 382 + ... + 6064.

It is an arithmetic number, because the mean of its divisors is an integer number (2506644).

Almost surely, 2^18316309 is an apocalyptic number.

It is an amenable number.

18316309 is a deficient number, since it is larger than the sum of its proper divisors (1736843).

18316309 is a wasteful number, since it uses less digits than its factorization.

18316309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5987.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 18316309 is about 4279.7557173278. The cubic root of 18316309 is about 263.6003528049.

The spelling of 18316309 in words is "eighteen million, three hundred sixteen thousand, three hundred nine".