19985963 has 2 divisors, whose sum is σ = 19985964. Its totient is φ = 19985962.

The previous prime is 19985941. The next prime is 19985969. The reversal of 19985963 is 36958991.

It is a strong prime.

It is an emirp because it is prime and its reverse (36958991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19985963 - 2¹² = 19981867 is a prime.

It is not a weakly prime, because it can be changed into another prime (19985969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992981 + 9992982.

It is an arithmetic number, because the mean of its divisors is an integer number (9992982).

Almost surely, 2^19985963 is an apocalyptic number.

19985963 is a deficient number, since it is larger than the sum of its proper divisors (1).

19985963 is an equidigital number, since it uses as much as digits as its factorization.

19985963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 50.

The square root of 19985963 is about 4470.5662952248. The cubic root of 19985963 is about 271.3782429968.

The spelling of 19985963 in words is "nineteen million, nine hundred eighty-five thousand, nine hundred sixty-three".