7440 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (40).
It is a nialpdrome in base 10.
It is a congruent number.
It is an unprimeable number.
27440 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 7440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11904).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
7440 is a wasteful number, since it uses less digits than its factorization.
7440 is an odious number, because the sum of its binary digits is odd.
The square root of 7440 is about 86.2554346114. The cubic root of 7440 is about 19.5220001534.
7440 divided by its sum of digits (15) gives a triangular number (496 = T31).
Adding to 7440 its reverse (447), we get a palindrome (7887).
The spelling of 7440 in words is "seven thousand, four hundred forty", and thus it is an iban number.