12668989 has 2 divisors, whose sum is σ = 12668990. Its totient is φ = 12668988.

The previous prime is 12668983. The next prime is 12669017. The reversal of 12668989 is 98986621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6543364 + 6125625 = 2558^2 + 2475^2 .

It is a cyclic number.

It is not a de Polignac number, because 12668989 - 2⁹ = 12668477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12668983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6334494 + 6334495.

It is an arithmetic number, because the mean of its divisors is an integer number (6334495).

Almost surely, 2^12668989 is an apocalyptic number.

It is an amenable number.

12668989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12668989 is an equidigital number, since it uses as much as digits as its factorization.

12668989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 12668989 is about 3559.3523287250. The cubic root of 12668989 is about 233.1206004388.

The spelling of 12668989 in words is "twelve million, six hundred sixty-eight thousand, nine hundred eighty-nine".