12867209 has 2 divisors, whose sum is σ = 12867210. Its totient is φ = 12867208.

The previous prime is 12867187. The next prime is 12867223. The reversal of 12867209 is 90276821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10061584 + 2805625 = 3172^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 12867209 - 2¹² = 12863113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12867229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6433604 + 6433605.

It is an arithmetic number, because the mean of its divisors is an integer number (6433605).

Almost surely, 2^12867209 is an apocalyptic number.

It is an amenable number.

12867209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12867209 is an equidigital number, since it uses as much as digits as its factorization.

12867209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 12867209 is about 3587.0892099305. The cubic root of 12867209 is about 234.3301218725.

The spelling of 12867209 in words is "twelve million, eight hundred sixty-seven thousand, two hundred nine".