9864 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (24).
It is a nude number because it is divisible by every one of its digits.
It is a plaindrome in base 16.
It is a nialpdrome in base 10.
It is an unprimeable number.
9864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
29864 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 9864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13455).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9864 is a wasteful number, since it uses less digits than its factorization.
9864 is an odious number, because the sum of its binary digits is odd.
The square root of 9864 is about 99.3176721435. The cubic root of 9864 is about 21.4462330582.
The spelling of 9864 in words is "nine thousand, eight hundred sixty-four".