12957279 has 4 divisors (see below), whose sum is σ = 17276376. Its totient is φ = 8638184.

The previous prime is 12957253. The next prime is 12957293. The reversal of 12957279 is 97275921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12957279 - 2⁷ = 12957151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12957279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12957209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2159544 + ... + 2159549.

It is an arithmetic number, because the mean of its divisors is an integer number (4319094).

Almost surely, 2^12957279 is an apocalyptic number.

12957279 is a deficient number, since it is larger than the sum of its proper divisors (4319097).

12957279 is an equidigital number, since it uses as much as digits as its factorization.

12957279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319096.

The product of its digits is 79380, while the sum is 42.

The square root of 12957279 is about 3599.6220634950. The cubic root of 12957279 is about 234.8756185003.

The spelling of 12957279 in words is "twelve million, nine hundred fifty-seven thousand, two hundred seventy-nine".