It is an ABA number since it can be written as A⋅BA, here for A=3, B=22.
It is a nialpdrome in base 8 and base 11.
It is a zygodrome in base 11.
It is a self number, because there is not a number n which added to its sum of digits gives 31944.
It is an unprimeable number.
31944 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
231944 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 31944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43920).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31944 is a wasteful number, since it uses less digits than its factorization.
31944 is an evil number, because the sum of its binary digits is even.
The square root of 31944 is about 178.7288449020. The cubic root of 31944 is about 31.7294905468.
The spelling of 31944 in words is "thirty-one thousand, nine hundred forty-four".