19680889 has 2 divisors, whose sum is σ = 19680890. Its totient is φ = 19680888.

The previous prime is 19680863. The next prime is 19680907. The reversal of 19680889 is 98808691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 11664 = 4435^2 + 108^2 .

It is a cyclic number.

It is not a de Polignac number, because 19680889 - 2⁹ = 19680377 is a prime.

It is not a weakly prime, because it can be changed into another prime (19680389) 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, 9840444 + 9840445.

It is an arithmetic number, because the mean of its divisors is an integer number (9840445).

Almost surely, 2^19680889 is an apocalyptic number.

It is an amenable number.

19680889 is a deficient number, since it is larger than the sum of its proper divisors (1).

19680889 is an equidigital number, since it uses as much as digits as its factorization.

19680889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 19680889 is about 4436.3147994704. The cubic root of 19680889 is about 269.9903471629.

The spelling of 19680889 in words is "nineteen million, six hundred eighty thousand, eight hundred eighty-nine".