Adding to 40440 its product of nonzero digits (64), we get a palindrome (40504).
Adding to 40440 its reverse (4404), we get a palindrome (44844).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a congruent number.
It is an unprimeable number.
240440 is an apocalyptic number.
40440 is a gapful number since it is divisible by the number (40) 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 40440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60840).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
40440 is a wasteful number, since it uses less digits than its factorization.
40440 is an evil number, because the sum of its binary digits is even.
The square root of 40440 is about 201.0969915240. The cubic root of 40440 is about 34.3244601655.
The spelling of 40440 in words is "forty thousand, four hundred forty", and thus it is an iban number.