It is a happy number.
612216 is nontrivially palindromic in base 10.
It is a nude number because it is divisible by every one of its digits.
It is a congruent number.
2612216 is an apocalyptic number.
612216 is a gapful number since it is divisible by the number (66) 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 612216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905580).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
612216 is a wasteful number, since it uses less digits than its factorization.
612216 is an odious number, because the sum of its binary digits is odd.
The square root of 612216 is about 782.4423301433. The cubic root of 612216 is about 84.9118347655.
The spelling of 612216 in words is "six hundred twelve thousand, two hundred sixteen".