12689279 has 2 divisors, whose sum is σ = 12689280. Its totient is φ = 12689278.

The previous prime is 12689273. The next prime is 12689297. The reversal of 12689279 is 97298621.

It is a happy number.

Together with next prime (12689297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12689279 - 2⁴ = 12689263 is a prime.

It is a super-2 number, since 2×12689279² = 322035603079682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12689273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6344639 + 6344640.

It is an arithmetic number, because the mean of its divisors is an integer number (6344640).

Almost surely, 2^12689279 is an apocalyptic number.

12689279 is a deficient number, since it is larger than the sum of its proper divisors (1).

12689279 is an equidigital number, since it uses as much as digits as its factorization.

12689279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 12689279 is about 3562.2014260847. The cubic root of 12689279 is about 233.2449853735.

The spelling of 12689279 in words is "twelve million, six hundred eighty-nine thousand, two hundred seventy-nine".