12897889 has 2 divisors, whose sum is σ = 12897890. Its totient is φ = 12897888.

The previous prime is 12897869. The next prime is 12897919. The reversal of 12897889 is 98879821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10890000 + 2007889 = 3300^2 + 1417^2 .

It is a cyclic number.

It is not a de Polignac number, because 12897889 - 2⁷ = 12897761 is a prime.

It is not a weakly prime, because it can be changed into another prime (12897809) 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, 6448944 + 6448945.

It is an arithmetic number, because the mean of its divisors is an integer number (6448945).

Almost surely, 2^12897889 is an apocalyptic number.

It is an amenable number.

12897889 is a deficient number, since it is larger than the sum of its proper divisors (1).

12897889 is an equidigital number, since it uses as much as digits as its factorization.

12897889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 52.

The square root of 12897889 is about 3591.3631116889. The cubic root of 12897889 is about 234.5162161474.

The spelling of 12897889 in words is "twelve million, eight hundred ninety-seven thousand, eight hundred eighty-nine".