Subtracting from 2646 its sum of digits (18), we obtain a triangular number (2628 = T72).
2646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a nialpdrome in base 14 and base 15.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 2646.
22646 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3420).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2646 is a wasteful number, since it uses less digits than its factorization.
2646 is an evil number, because the sum of its binary digits is even.
The square root of 2646 is about 51.4392845984. The cubic root of 2646 is about 13.8313088762.
The spelling of 2646 in words is "two thousand, six hundred forty-six".