Adding to 22440 its reverse (4422), we get a palindrome (26862).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
22440 is an undulating number in base 13.
It is a congruent number.
222440 is an apocalyptic number.
22440 is a gapful number since it is divisible by the number (20) 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 22440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
22440 is a wasteful number, since it uses less digits than its factorization.
22440 is an evil number, because the sum of its binary digits is even.
The square root of 22440 is about 149.7998664886. The cubic root of 22440 is about 28.2059642332.
The spelling of 22440 in words is "twenty-two thousand, four hundred forty", and thus it is an iban number.