19776 has 28 divisors (see below), whose sum is σ = 52832. Its totient is φ = 6528.

The previous prime is 19763. The next prime is 19777. The reversal of 19776 is 67791.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19777) by changing a digit.

19776 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141 + ... + 243.

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).

19776 is an abundant number, since it is smaller than the sum of its proper divisors (33056).

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 sum of its prime factors is 118 (or 108 counting only the distinct ones).

The product of its digits is 2646, while the sum is 30.

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".