18186225 has 12 divisors (see below), whose sum is σ = 30068016. Its totient is φ = 9699280.

The previous prime is 18186199. The next prime is 18186263. The reversal of 18186225 is 52268181.

It is not a de Polignac number, because 18186225 - 2¹³ = 18178033 is a prime.

It is a Curzon number.

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, 121167 + ... + 121316.

It is an arithmetic number, because the mean of its divisors is an integer number (2505668).

Almost surely, 2^18186225 is an apocalyptic number.

18186225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18186225 is a deficient number, since it is larger than the sum of its proper divisors (11881791).

18186225 is a wasteful number, since it uses less digits than its factorization.

18186225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242496 (or 242491 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 18186225 is about 4264.5310410407. The cubic root of 18186225 is about 262.9748321755.

The spelling of 18186225 in words is "eighteen million, one hundred eighty-six thousand, two hundred twenty-five".