12989287 has 2 divisors, whose sum is σ = 12989288. Its totient is φ = 12989286.

The previous prime is 12989281. The next prime is 12989297. The reversal of 12989287 is 78298921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12989287 - 2⁷ = 12989159 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12989281) 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, 6494643 + 6494644.

It is an arithmetic number, because the mean of its divisors is an integer number (6494644).

Almost surely, 2^12989287 is an apocalyptic number.

12989287 is a deficient number, since it is larger than the sum of its proper divisors (1).

12989287 is an equidigital number, since it uses as much as digits as its factorization.

12989287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 12989287 is about 3604.0653434698. The cubic root of 12989287 is about 235.0688616666.

It can be divided in two parts, 1298 and 9287, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 12989287 in words is "twelve million, nine hundred eighty-nine thousand, two hundred eighty-seven".