It is a nialpdrome in base 12.
It is a congruent number.
19776 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
219776 is an apocalyptic number.
19776 is a gapful number since it is divisible by the number (16) 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 19776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26416).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19776 is a wasteful number, since it uses less digits than its factorization.
19776 is an odious number, because the sum of its binary digits is odd.
The square root of 19776 is about 140.6271666500. The cubic root of 19776 is about 27.0424572070.
Adding to 19776 its product of digits (2646), we get a palindrome (22422).
The spelling of 19776 in words is "nineteen thousand, seven hundred seventy-six".