Adding to 990725 its reverse (527099), we get a square (1517824 = 12322).
990725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a Duffinian number.
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 990725.
It is an unprimeable number.
2990725 is an apocalyptic number.
990725 is the 575-th octagonal number.
It is an amenable number.
990725 is a wasteful number, since it uses less digits than its factorization.
990725 is an evil number, because the sum of its binary digits is even.
The square root of 990725 is about 995.3516966379. The cubic root of 990725 is about 99.6898725372.
The spelling of 990725 in words is "nine hundred ninety thousand, seven hundred twenty-five".