18225188 has 12 divisors (see below), whose sum is σ = 32098332. Its totient is φ = 9054240.

The previous prime is 18225187. The next prime is 18225209. The reversal of 18225188 is 88152281.

It can be written as a sum of positive squares in 2 ways, for example, as 13017664 + 5207524 = 3608^2 + 2282^2 .

It is not an unprimeable number, because it can be changed into a prime (18225187) 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, 13883 + ... + 15138.

It is an arithmetic number, because the mean of its divisors is an integer number (2674861).

Almost surely, 2^18225188 is an apocalyptic number.

It is an amenable number.

18225188 is a deficient number, since it is larger than the sum of its proper divisors (13873144).

18225188 is a wasteful number, since it uses less digits than its factorization.

18225188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29182 (or 29180 counting only the distinct ones).

The product of its digits is 10240, while the sum is 35.

The square root of 18225188 is about 4269.0968599928. The cubic root of 18225188 is about 263.1625013173.

The spelling of 18225188 in words is "eighteen million, two hundred twenty-five thousand, one hundred eighty-eight".