12687869 has 2 divisors, whose sum is σ = 12687870. Its totient is φ = 12687868.

The previous prime is 12687863. The next prime is 12687887. The reversal of 12687869 is 96878621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12687844 + 25 = 3562^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 12687869 - 2⁴ = 12687853 is a prime.

It is a super-2 number, since 2×12687869² = 321964039522322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12687863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6343934 + 6343935.

It is an arithmetic number, because the mean of its divisors is an integer number (6343935).

Almost surely, 2^12687869 is an apocalyptic number.

It is an amenable number.

12687869 is a deficient number, since it is larger than the sum of its proper divisors (1).

12687869 is an equidigital number, since it uses as much as digits as its factorization.

12687869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 12687869 is about 3562.0035092627. The cubic root of 12687869 is about 233.2363458595.

The spelling of 12687869 in words is "twelve million, six hundred eighty-seven thousand, eight hundred sixty-nine".