19768289 has 2 divisors, whose sum is σ = 19768290. Its totient is φ = 19768288.

The previous prime is 19768279. The next prime is 19768321. The reversal of 19768289 is 98286791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 2917264 = 4105^2 + 1708^2 .

It is a cyclic number.

It is not a de Polignac number, because 19768289 - 2¹² = 19764193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19768219) 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, 9884144 + 9884145.

It is an arithmetic number, because the mean of its divisors is an integer number (9884145).

Almost surely, 2^19768289 is an apocalyptic number.

It is an amenable number.

19768289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19768289 is an equidigital number, since it uses as much as digits as its factorization.

19768289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 19768289 is about 4446.1544057758. The cubic root of 19768289 is about 270.3894197817.

It can be divided in two parts, 197 and 68289, that added together give a palindrome (68486).

The spelling of 19768289 in words is "nineteen million, seven hundred sixty-eight thousand, two hundred eighty-nine".