19963 has 2 divisors, whose sum is σ = 19964. Its totient is φ = 19962.

The previous prime is 19961. The next prime is 19973. The reversal of 19963 is 36991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19963 - 2¹ = 19961 is a prime.

Together with 19961, it forms a pair of twin primes.

19963 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (19961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9981 + 9982.

It is an arithmetic number, because the mean of its divisors is an integer number (9982).

2¹⁹⁹⁶³ is an apocalyptic number.

19963 is a deficient number, since it is larger than the sum of its proper divisors (1).

19963 is an equidigital number, since it uses as much as digits as its factorization.

19963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 28.

The square root of 19963 is about 141.2904809249. The cubic root of 19963 is about 27.1274269244.

Adding to 19963 its sum of digits (28), we get a palindrome (19991).

It can be divided in two parts, 199 and 63, that added together give a palindrome (262).

The spelling of 19963 in words is "nineteen thousand, nine hundred sixty-three".