18224225 has 6 divisors (see below), whose sum is σ = 22598070. Its totient is φ = 14579360.

The previous prime is 18224191. The next prime is 18224243. The reversal of 18224225 is 52242281.

It can be written as a sum of positive squares in 3 ways, for example, as 238144 + 17986081 = 488^2 + 4241^2 .

It is not a de Polignac number, because 18224225 - 2⁶ = 18224161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18224194 and 18224203.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364460 + ... + 364509.

It is an arithmetic number, because the mean of its divisors is an integer number (3766345).

Almost surely, 2^18224225 is an apocalyptic number.

It is an amenable number.

18224225 is a deficient number, since it is larger than the sum of its proper divisors (4373845).

18224225 is an equidigital number, since it uses as much as digits as its factorization.

18224225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728979 (or 728974 counting only the distinct ones).

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

The square root of 18224225 is about 4268.9840711813. The cubic root of 18224225 is about 263.1578661579.

The spelling of 18224225 in words is "eighteen million, two hundred twenty-four thousand, two hundred twenty-five".