Subtracting from 11643 its sum of digits (15), we obtain a triangular number (11628 = T152).
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a D-number.
11643 is a lucky number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 11643.
211643 is an apocalyptic number.
11643 is an equidigital number, since it uses as much as digits as its factorization.
11643 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3884.
The square root of 11643 is about 107.9027339783. The cubic root of 11643 is about 22.6649604637.
The spelling of 11643 in words is "eleven thousand, six hundred forty-three".