18328225 has 12 divisors (see below), whose sum is σ = 22816620. Its totient is φ = 14604800.

The previous prime is 18328201. The next prime is 18328231. The reversal of 18328225 is 52282381.

It can be written as a sum of positive squares in 6 ways, for example, as 69696 + 18258529 = 264^2 + 4273^2 .

It is not a de Polignac number, because 18328225 - 2⁷ = 18328097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5721 + ... + 8329.

It is an arithmetic number, because the mean of its divisors is an integer number (1901385).

Almost surely, 2^18328225 is an apocalyptic number.

It is an amenable number.

18328225 is a deficient number, since it is larger than the sum of its proper divisors (4488395).

18328225 is a wasteful number, since it uses less digits than its factorization.

18328225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900 (or 2895 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 18328225 is about 4281.1476265132. The cubic root of 18328225 is about 263.6575037096.

The spelling of 18328225 in words is "eighteen million, three hundred twenty-eight thousand, two hundred twenty-five".