12431399 has 2 divisors, whose sum is σ = 12431400. Its totient is φ = 12431398.

The previous prime is 12431387. The next prime is 12431407. The reversal of 12431399 is 99313421.

12431399 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12431399 - 2⁸ = 12431143 is a prime.

It is a super-3 number, since 3×12431399³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12431329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6215699 + 6215700.

It is an arithmetic number, because the mean of its divisors is an integer number (6215700).

Almost surely, 2^12431399 is an apocalyptic number.

12431399 is a deficient number, since it is larger than the sum of its proper divisors (1).

12431399 is an equidigital number, since it uses as much as digits as its factorization.

12431399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 12431399 is about 3525.8189119692. The cubic root of 12431399 is about 231.6541057892.

The spelling of 12431399 in words is "twelve million, four hundred thirty-one thousand, three hundred ninety-nine".