It is a tau number, because it is divible by the number of its divisors (64).
It is an Ulam number.
It is a nialpdrome in base 8.
It is a congruent number.
213440 is an apocalyptic number.
13440 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 13440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
13440 is an equidigital number, since it uses as much as digits as its factorization.
13440 is an evil number, because the sum of its binary digits is even.
The square root of 13440 is about 115.9310139695. The cubic root of 13440 is about 23.7756878111.
Adding to 13440 its reverse (4431), we get a palindrome (17871).
Subtracting from 13440 its reverse (4431), we obtain a palindrome (9009).
The spelling of 13440 in words is "thirteen thousand, four hundred forty".