It is a happy 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 126720.
It is an unprimeable number.
2126720 is an apocalyptic number.
126720 is a gapful number since it is divisible by the number (10) 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 126720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239148).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
126720 is a wasteful number, since it uses less digits than its factorization.
126720 is an evil number, because the sum of its binary digits is even.
The square root of 126720 is about 355.9775273806. The cubic root of 126720 is about 50.2282894258.
Subtracting from 126720 its reverse (27621), we obtain a palindrome (99099).
The spelling of 126720 in words is "one hundred twenty-six thousand, seven hundred twenty".