12957239 has 2 divisors, whose sum is σ = 12957240. Its totient is φ = 12957238.

The previous prime is 12957223. The next prime is 12957251. The reversal of 12957239 is 93275921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12957239 - 2⁴ = 12957223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12957209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6478619 + 6478620.

It is an arithmetic number, because the mean of its divisors is an integer number (6478620).

Almost surely, 2^12957239 is an apocalyptic number.

12957239 is a deficient number, since it is larger than the sum of its proper divisors (1).

12957239 is an equidigital number, since it uses as much as digits as its factorization.

12957239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 38.

The square root of 12957239 is about 3599.6165073519. The cubic root of 12957239 is about 234.8753768077.

The spelling of 12957239 in words is "twelve million, nine hundred fifty-seven thousand, two hundred thirty-nine".