18504224 has 24 divisors (see below), whose sum is σ = 36561168. Its totient is φ = 9218880.

The previous prime is 18504223. The next prime is 18504287. The reversal of 18504224 is 42240581.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18504193 and 18504202.

It is not an unprimeable number, because it can be changed into a prime (18504223) 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, 9719 + ... + 11465.

It is an arithmetic number, because the mean of its divisors is an integer number (1523382).

Almost surely, 2^18504224 is an apocalyptic number.

It is an amenable number.

18504224 is a deficient number, since it is larger than the sum of its proper divisors (18056944).

18504224 is a wasteful number, since it uses less digits than its factorization.

18504224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 18504224 is about 4301.6536355220. The cubic root of 18504224 is about 264.4987510706.

The spelling of 18504224 in words is "eighteen million, five hundred four thousand, two hundred twenty-four".