18328309 has 8 divisors (see below), whose sum is σ = 19357632. Its totient is φ = 17318400.

The previous prime is 18328307. The next prime is 18328333. The reversal of 18328309 is 90382381.

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 18328309 - 2¹ = 18328307 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 (18328307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2892 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (2419704).

Almost surely, 2^18328309 is an apocalyptic number.

It is an amenable number.

18328309 is a deficient number, since it is larger than the sum of its proper divisors (1029323).

18328309 is an equidigital number, since it uses as much as digits as its factorization.

18328309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9707.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18328309 is about 4281.1574369556. The cubic root of 18328309 is about 263.6579064982.

The spelling of 18328309 in words is "eighteen million, three hundred twenty-eight thousand, three hundred nine".