18305825 has 6 divisors (see below), whose sum is σ = 22699254. Its totient is φ = 14644640.

The previous prime is 18305813. The next prime is 18305827. The reversal of 18305825 is 52850381.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5230369 + 13075456 = 2287^2 + 3616^2 .

It is not a de Polignac number, because 18305825 - 2²⁰ = 17257249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18305791 and 18305800.

It is not an unprimeable number, because it can be changed into a prime (18305827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 366092 + ... + 366141.

It is an arithmetic number, because the mean of its divisors is an integer number (3783209).

Almost surely, 2^18305825 is an apocalyptic number.

It is an amenable number.

18305825 is a deficient number, since it is larger than the sum of its proper divisors (4393429).

18305825 is an equidigital number, since it uses as much as digits as its factorization.

18305825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732243 (or 732238 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 18305825 is about 4278.5307057447. The cubic root of 18305825 is about 263.5500494833.

The spelling of 18305825 in words is "eighteen million, three hundred five thousand, eight hundred twenty-five".