18185828 has 12 divisors (see below), whose sum is σ = 31862460. Its totient is φ = 9082272.

The previous prime is 18185821. The next prime is 18185891. The reversal of 18185828 is 82858181.

It can be written as a sum of positive squares in 2 ways, for example, as 4804864 + 13380964 = 2192^2 + 3658^2 .

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 3 ways as a sum of consecutive naturals, for example, 2150 + ... + 6402.

It is an arithmetic number, because the mean of its divisors is an integer number (2655205).

Almost surely, 2^18185828 is an apocalyptic number.

It is an amenable number.

18185828 is a deficient number, since it is larger than the sum of its proper divisors (13676632).

18185828 is a wasteful number, since it uses less digits than its factorization.

18185828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5326 (or 5324 counting only the distinct ones).

The product of its digits is 40960, while the sum is 41.

The square root of 18185828 is about 4264.4844940508. The cubic root of 18185828 is about 262.9729186069.

The spelling of 18185828 in words is "eighteen million, one hundred eighty-five thousand, eight hundred twenty-eight".