It is a happy number.
It is a congruent number.
866272 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2866272 is an apocalyptic number.
866272 is the 498-th centered heptagonal number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 866272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979776).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
866272 is a wasteful number, since it uses less digits than its factorization.
866272 is an odious number, because the sum of its binary digits is odd.
The square root of 866272 is about 930.7373421111. The cubic root of 866272 is about 95.3274755829.
The spelling of 866272 in words is "eight hundred sixty-six thousand, two hundred seventy-two".