Subtracting from 13640 its reverse (4631), we obtain a palindrome (9009).
13640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.
13640 is strictly pandigital in base 6.
213640 is an apocalyptic number.
13640 is a gapful number since it is divisible by the number (10) 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 13640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17280).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
13640 is a wasteful number, since it uses less digits than its factorization.
13640 is an evil number, because the sum of its binary digits is even.
The square root of 13640 is about 116.7904105653. The cubic root of 13640 is about 23.8930425644.
The spelling of 13640 in words is "thirteen thousand, six hundred forty".