11856 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.
It is a plaindrome in base 14.
It is a nialpdrome in base 13.
It is a zygodrome in base 5.
It is a congruent number.
It is an unprimeable number.
11856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
211856 is an apocalyptic number.
11856 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 11856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
11856 is a wasteful number, since it uses less digits than its factorization.
11856 is an evil number, because the sum of its binary digits is even.
The square root of 11856 is about 108.8852607105. The cubic root of 11856 is about 22.8023389413.
The spelling of 11856 in words is "eleven thousand, eight hundred fifty-six".