18256 has 20 divisors (see below), whose sum is σ = 40672. Its totient is φ = 7776.

The previous prime is 18253. The next prime is 18257. The reversal of 18256 is 65281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18251) 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, 31 + ... + 193.

2¹⁸²⁵⁶ is an apocalyptic number.

18256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20336).

18256 is an abundant number, since it is smaller than the sum of its proper divisors (22416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18256 is a wasteful number, since it uses less digits than its factorization.

18256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 172 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 18256 is about 135.1147660324. The cubic root of 18256 is about 26.3310721055.

The spelling of 18256 in words is "eighteen thousand, two hundred fifty-six".