12684389 has 2 divisors, whose sum is σ = 12684390. Its totient is φ = 12684388.

The previous prime is 12684367. The next prime is 12684403. The reversal of 12684389 is 98348621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8850625 + 3833764 = 2975^2 + 1958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12684389 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 (12684359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6342194 + 6342195.

It is an arithmetic number, because the mean of its divisors is an integer number (6342195).

Almost surely, 2^12684389 is an apocalyptic number.

It is an amenable number.

12684389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12684389 is an equidigital number, since it uses as much as digits as its factorization.

12684389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 12684389 is about 3561.5149866314. The cubic root of 12684389 is about 233.2150200639.

The spelling of 12684389 in words is "twelve million, six hundred eighty-four thousand, three hundred eighty-nine".