12439279 has 2 divisors, whose sum is σ = 12439280. Its totient is φ = 12439278.

The previous prime is 12439253. The next prime is 12439283. The reversal of 12439279 is 97293421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12439279 - 2¹⁷ = 12308207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12439879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6219639 + 6219640.

It is an arithmetic number, because the mean of its divisors is an integer number (6219640).

Almost surely, 2^12439279 is an apocalyptic number.

12439279 is a deficient number, since it is larger than the sum of its proper divisors (1).

12439279 is an equidigital number, since it uses as much as digits as its factorization.

12439279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 12439279 is about 3526.9362058308. The cubic root of 12439279 is about 231.7030423245.

The spelling of 12439279 in words is "twelve million, four hundred thirty-nine thousand, two hundred seventy-nine".