18309224 has 16 divisors (see below), whose sum is σ = 34843200. Its totient is φ = 9017712.

The previous prime is 18309223. The next prime is 18309233. The reversal of 18309224 is 42290381.

It is not an unprimeable number, because it can be changed into a prime (18309223) 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, 16544 + ... + 17615.

It is an arithmetic number, because the mean of its divisors is an integer number (2177700).

Almost surely, 2^18309224 is an apocalyptic number.

It is an amenable number.

18309224 is a deficient number, since it is larger than the sum of its proper divisors (16533976).

18309224 is a wasteful number, since it uses less digits than its factorization.

18309224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34232 (or 34228 counting only the distinct ones).

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

The square root of 18309224 is about 4278.9279031084. The cubic root of 18309224 is about 263.5663603421.

The spelling of 18309224 in words is "eighteen million, three hundred nine thousand, two hundred twenty-four".