It is a happy number.
It is a tau number, because it is divible by the number of its divisors (56).
It is an Ulam number.
It is a nialpdrome in base 9.
It is a congruent number.
240824 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 40824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65580).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
40824 is an equidigital number, since it uses as much as digits as its factorization.
40824 is an evil number, because the sum of its binary digits is even.
The square root of 40824 is about 202.0494988858. The cubic root of 40824 is about 34.4327612899.
The spelling of 40824 in words is "forty thousand, eight hundred twenty-four".