1728969889 has 2 divisors, whose sum is σ = 1728969890. Its totient is φ = 1728969888.

The previous prime is 1728969863. The next prime is 1728969899. The reversal of 1728969889 is 9889698271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1456719889 + 272250000 = 38167^2 + 16500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728969889 - 2⁵ = 1728969857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1728969829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864484944 + 864484945.

It is an arithmetic number, because the mean of its divisors is an integer number (864484945).

Almost surely, 2^1728969889 is an apocalyptic number.

It is an amenable number.

1728969889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728969889 is an equidigital number, since it uses as much as digits as its factorization.

1728969889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 67.

The square root of 1728969889 is about 41580.8836967181. The cubic root of 1728969889 is about 1200.2244693512.

It can be divided in two parts, 17289 and 69889, that added together give a palindrome (87178).

The spelling of 1728969889 in words is "one billion, seven hundred twenty-eight million, nine hundred sixty-nine thousand, eight hundred eighty-nine".