It is an Ulam number.
It is a congruent number.
222400 is an apocalyptic number.
22400 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 22400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31620).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
22400 is an equidigital number, since it uses as much as digits as its factorization.
22400 is an evil number, because the sum of its binary digits is even.
The square root of 22400 is about 149.6662954710. Note that the first 3 decimals coincide. The cubic root of 22400 is about 28.1891949283.
Adding to 22400 its reverse (422), we get a palindrome (22822).
The spelling of 22400 in words is "twenty-two thousand, four hundred", and thus it is an iban number.