It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 984390.
984390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2984390 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 984390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
984390 is a wasteful number, since it uses less digits than its factorization.
984390 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 197.
The square root of 984390 is about 992.1643009099. The cubic root of 984390 is about 99.4769354719.
The spelling of 984390 in words is "nine hundred eighty-four thousand, three hundred ninety".