18185825 has 12 divisors (see below), whose sum is σ = 25772160. Its totient is φ = 12470160.

The previous prime is 18185821. The next prime is 18185891. The reversal of 18185825 is 52858181.

It is not a de Polignac number, because 18185825 - 2² = 18185821 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18185821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51785 + ... + 52134.

It is an arithmetic number, because the mean of its divisors is an integer number (2147680).

Almost surely, 2^18185825 is an apocalyptic number.

It is an amenable number.

18185825 is a deficient number, since it is larger than the sum of its proper divisors (7586335).

18185825 is a wasteful number, since it uses less digits than its factorization.

18185825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103936 (or 103931 counting only the distinct ones).

The product of its digits is 25600, while the sum is 38.

The square root of 18185825 is about 4264.4841423084. The cubic root of 18185825 is about 262.9729041466.

The spelling of 18185825 in words is "eighteen million, one hundred eighty-five thousand, eight hundred twenty-five".