18227 has 4 divisors (see below), whose sum is σ = 19896. Its totient is φ = 16560.
The previous prime is 18223. The next prime is 18229. The reversal of 18227 is 72281.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72281 = 11 ⋅6571.
It is a cyclic number.
It is not a de Polignac number, because 18227 - 22 = 18223 is a prime.
It is a Duffinian number.
It is a plaindrome in base 14.
It is a junction number, because it is equal to n+sod(n) for n = 18199 and 18208.
It is not an unprimeable number, because it can be changed into a prime (18223) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818 + ... + 839.
It is an arithmetic number, because the mean of its divisors is an integer number (4974).
218227 is an apocalyptic number.
18227 is a deficient number, since it is larger than the sum of its proper divisors (1669).
18227 is a wasteful number, since it uses less digits than its factorization.
18227 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1668.
The product of its digits is 224, while the sum is 20.
The square root of 18227 is about 135.0074072042. The cubic root of 18227 is about 26.3171222483.
It can be divided in two parts, 1 and 8227, that added together give a palindrome (8228).
The spelling of 18227 in words is "eighteen thousand, two hundred twenty-seven".
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