12865999 has 2 divisors, whose sum is σ = 12866000. Its totient is φ = 12865998.

The previous prime is 12865997. The next prime is 12866011. The reversal of 12865999 is 99956821.

12865999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12865999 - 2¹ = 12865997 is a prime.

Together with 12865997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12865997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6432999 + 6433000.

It is an arithmetic number, because the mean of its divisors is an integer number (6433000).

Almost surely, 2^12865999 is an apocalyptic number.

12865999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12865999 is an equidigital number, since it uses as much as digits as its factorization.

12865999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The square root of 12865999 is about 3586.9205455376. The cubic root of 12865999 is about 234.3227763703.

The spelling of 12865999 in words is "twelve million, eight hundred sixty-five thousand, nine hundred ninety-nine".