12440431 has 2 divisors, whose sum is σ = 12440432. Its totient is φ = 12440430.

The previous prime is 12440429. The next prime is 12440453. The reversal of 12440431 is 13404421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12440431 - 2¹ = 12440429 is a prime.

It is a super-2 number, since 2×12440431² = 309528646931522, which contains 22 as substring.

Together with 12440429, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12440399 and 12440408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12440411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220215 + 6220216.

It is an arithmetic number, because the mean of its divisors is an integer number (6220216).

Almost surely, 2^12440431 is an apocalyptic number.

12440431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440431 is an equidigital number, since it uses as much as digits as its factorization.

12440431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 12440431 is about 3527.0995166000. The cubic root of 12440431 is about 231.7101947665.

Adding to 12440431 its reverse (13404421), we get a palindrome (25844852).

The spelling of 12440431 in words is "twelve million, four hundred forty thousand, four hundred thirty-one".