12789989 has 4 divisors (see below), whose sum is σ = 12798156. Its totient is φ = 12781824.

The previous prime is 12789979. The next prime is 12790007. The reversal of 12789989 is 98998721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 293764 + 12496225 = 542^2 + 3535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12789989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12789989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12789919) 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 in 3 ways as a sum of consecutive naturals, for example, 914 + ... + 5139.

It is an arithmetic number, because the mean of its divisors is an integer number (3199539).

Almost surely, 2^12789989 is an apocalyptic number.

It is an amenable number.

12789989 is a deficient number, since it is larger than the sum of its proper divisors (8167).

12789989 is an equidigital number, since it uses as much as digits as its factorization.

12789989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8166.

The product of its digits is 653184, while the sum is 53.

The square root of 12789989 is about 3576.3094105516. The cubic root of 12789989 is about 233.8604191064.

The spelling of 12789989 in words is "twelve million, seven hundred eighty-nine thousand, nine hundred eighty-nine".