13720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a nialpdrome in base 7 and base 14.
It is a zygodrome in base 7.
It is a self number, because there is not a number n which added to its sum of digits gives 13720.
It is a congruent number.
13720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
213720 is an apocalyptic number.
13720 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 13720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
13720 is an equidigital number, since it uses as much as digits as its factorization.
13720 is an odious number, because the sum of its binary digits is odd.
The square root of 13720 is about 117.1324037148. The cubic root of 13720 is about 23.9396632535.
The spelling of 13720 in words is "thirteen thousand, seven hundred twenty".