12864389 has 2 divisors, whose sum is σ = 12864390. Its totient is φ = 12864388.

The previous prime is 12864373. The next prime is 12864403. The reversal of 12864389 is 98346821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 5841889 = 2650^2 + 2417^2 .

It is a cyclic number.

It is not a de Polignac number, because 12864389 - 2⁴ = 12864373 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 (12864329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6432194 + 6432195.

It is an arithmetic number, because the mean of its divisors is an integer number (6432195).

Almost surely, 2^12864389 is an apocalyptic number.

It is an amenable number.

12864389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12864389 is an equidigital number, since it uses as much as digits as its factorization.

12864389 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 12864389 is about 3586.6961120229. The cubic root of 12864389 is about 234.3130018888.

The spelling of 12864389 in words is "twelve million, eight hundred sixty-four thousand, three hundred eighty-nine".