Adding to 999000 its reverse (999), we get a palindrome (999999).
Subtracting from 999000 its reverse (999), we obtain a square (998001 = 9992).
999000 divided by its reverse (999) gives a cube (1000 = 103).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a congruent number.
999000 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2999000 is an apocalyptic number.
999000 is a gapful number since it is divisible by the number (90) 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 999000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1778400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999000 is a wasteful number, since it uses less digits than its factorization.
999000 is an evil number, because the sum of its binary digits is even.
The square root of 999000 is about 999.4998749375. The cubic root of 999000 is about 99.9666555494.
The spelling of 999000 in words is "nine hundred ninety-nine thousand".