18324209 has 4 divisors (see below), whose sum is σ = 18340416. Its totient is φ = 18308004.

The previous prime is 18324197. The next prime is 18324221. The reversal of 18324209 is 90242381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18324197) and next prime (18324221).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18324209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18324239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6269 + ... + 8714.

It is an arithmetic number, because the mean of its divisors is an integer number (4585104).

Almost surely, 2^18324209 is an apocalyptic number.

It is an amenable number.

18324209 is a deficient number, since it is larger than the sum of its proper divisors (16207).

18324209 is a wasteful number, since it uses less digits than its factorization.

18324209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16206.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18324209 is about 4280.6785677040. The cubic root of 18324209 is about 263.6382451457.

The spelling of 18324209 in words is "eighteen million, three hundred twenty-four thousand, two hundred nine".