Subtracting from 999944 its reverse (449999), we obtain a palindrome (549945).
It is a happy number.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is an unprimeable number.
2999944 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 999944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031415).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999944 is a wasteful number, since it uses less digits than its factorization.
999944 is an odious number, because the sum of its binary digits is odd.
The square root of 999944 is about 999.9719996080. The cubic root of 999944 is about 99.9981332985.
The spelling of 999944 in words is "nine hundred ninety-nine thousand, nine hundred forty-four".