18327205 has 36 divisors (see below), whose sum is σ = 25502148. Its totient is φ = 12629760.

The previous prime is 18327203. The next prime is 18327209. The reversal of 18327205 is 50272381.

It can be written as a sum of positive squares in 6 ways, for example, as 8398404 + 9928801 = 2898^2 + 3151^2 .

It is not a de Polignac number, because 18327205 - 2¹ = 18327203 is a prime.

It is a super-2 number, since 2×18327205² = 671772886224050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18327203) 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 35 ways as a sum of consecutive naturals, for example, 446985 + ... + 447025.

It is an arithmetic number, because the mean of its divisors is an integer number (708393).

Almost surely, 2^18327205 is an apocalyptic number.

It is an amenable number.

18327205 is a deficient number, since it is larger than the sum of its proper divisors (7174943).

18327205 is a wasteful number, since it uses less digits than its factorization.

18327205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 18327205 is about 4281.0284979196. The cubic root of 18327205 is about 263.6526126078.

Adding to 18327205 its reverse (50272381), we get a palindrome (68599586).

The spelling of 18327205 in words is "eighteen million, three hundred twenty-seven thousand, two hundred five".