12431239 has 2 divisors, whose sum is σ = 12431240. Its totient is φ = 12431238.

The previous prime is 12431197. The next prime is 12431281. The reversal of 12431239 is 93213421.

It is a balanced prime because it is at equal distance from previous prime (12431197) and next prime (12431281).

It is a cyclic number.

It is not a de Polignac number, because 12431239 - 2⁹ = 12430727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12437239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6215619 + 6215620.

It is an arithmetic number, because the mean of its divisors is an integer number (6215620).

Almost surely, 2^12431239 is an apocalyptic number.

12431239 is a deficient number, since it is larger than the sum of its proper divisors (1).

12431239 is an equidigital number, since it uses as much as digits as its factorization.

12431239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 12431239 is about 3525.7962221320. The cubic root of 12431239 is about 231.6531119398.

The spelling of 12431239 in words is "twelve million, four hundred thirty-one thousand, two hundred thirty-nine".