18285 has 16 divisors (see below), whose sum is σ = 31104. Its totient is φ = 9152.
The previous prime is 18269. The next prime is 18287. The reversal of 18285 is 58281.
18285 = 412 + 422 + ... + 492.
It is a cyclic number.
It is not a de Polignac number, because 18285 - 24 = 18269 is a prime.
It is a Curzon number.
18285 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (18287) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319 + ... + 371.
It is an arithmetic number, because the mean of its divisors is an integer number (1944).
218285 is an apocalyptic number.
18285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
18285 is a deficient number, since it is larger than the sum of its proper divisors (12819).
18285 is a wasteful number, since it uses less digits than its factorization.
18285 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 84.
The product of its digits is 640, while the sum is 24.
The square root of 18285 is about 135.2220396237. Note that the first 3 decimals coincide. The cubic root of 18285 is about 26.3450071975.
It can be divided in two parts, 18 and 285, that added together give a palindrome (303).
The spelling of 18285 in words is "eighteen thousand, two hundred eighty-five".
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