18225225 has 18 divisors (see below), whose sum is σ = 32643806. Its totient is φ = 9720000.

The previous prime is 18225209. The next prime is 18225227. The reversal of 18225225 is 52252281.

It can be written as a sum of positive squares in 3 ways, for example, as 3640464 + 14584761 = 1908^2 + 3819^2 .

It is not a de Polignac number, because 18225225 - 2⁴ = 18225209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18225227) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40276 + ... + 40725.

Almost surely, 2^18225225 is an apocalyptic number.

18225225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18225225 is a deficient number, since it is larger than the sum of its proper divisors (14418581).

18225225 is a wasteful number, since it uses less digits than its factorization.

18225225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81017 (or 81009 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 18225225 is about 4269.1011934598. The cubic root of 18225225 is about 263.1626794042.

It can be divided in two parts, 18225 and 225, that multiplied together give a 4-th power (4100625 = 45⁴).

The spelling of 18225225 in words is "eighteen million, two hundred twenty-five thousand, two hundred twenty-five".