It is a happy number.
44 is nontrivially palindromic in base 10.
44 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
44 is an esthetic number in base 8 and base 14, because in such bases it adjacent digits differ by 1.
It is a nude number because it is divisible by every one of its digits.
It is a tribonacci number.
It is a O'Halloran number.
44 is a nontrivial repdigit in base 10.
It is a plaindrome in base 3, base 5, base 6, base 9, base 10, base 12, base 13, base 15 and base 16.
It is a nialpdrome in base 7, base 8, base 10, base 11 and base 14.
It is a zygodrome in base 3 and base 10.
It is a subfactorial, being equal to the number of derangements of 5 objects .
It is an amenable number.
44 is a wasteful number, since it uses less digits than its factorization.
44 is an odious number, because the sum of its binary digits is odd.
The square root of 44 is about 6.6332495807. The cubic root of 44 is about 3.5303483353.