12917239 has 2 divisors, whose sum is σ = 12917240. Its totient is φ = 12917238.

The previous prime is 12917221. The next prime is 12917249. The reversal of 12917239 is 93271921.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93271921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12917239 - 2¹³ = 12909047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12917249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6458619 + 6458620.

It is an arithmetic number, because the mean of its divisors is an integer number (6458620).

Almost surely, 2^12917239 is an apocalyptic number.

12917239 is a deficient number, since it is larger than the sum of its proper divisors (1).

12917239 is an equidigital number, since it uses as much as digits as its factorization.

12917239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 12917239 is about 3594.0560652277. The cubic root of 12917239 is about 234.6334348477.

The spelling of 12917239 in words is "twelve million, nine hundred seventeen thousand, two hundred thirty-nine".