3996 is nontrivially palindromic in base 11.
It is a nude number because it is divisible by every one of its digits.
It is a nialpdrome in base 9.
It is a zygodrome in base 2.
It is a congruent number.
It is an unprimeable number.
23996 is an apocalyptic number.
3996 is a gapful number since it is divisible by the number (36) 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 3996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5320).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3996 is a wasteful number, since it uses less digits than its factorization.
3996 is an evil number, because the sum of its binary digits is even.
The square root of 3996 is about 63.2139225171. The cubic root of 3996 is about 15.8687174181.
Subtracting from 3996 its sum of digits (27), we obtain a square (3969 = 632).
The spelling of 3996 in words is "three thousand, nine hundred ninety-six".