12440123431 has 2 divisors, whose sum is σ = 12440123432. Its totient is φ = 12440123430.

The previous prime is 12440123411. The next prime is 12440123489. The reversal of 12440123431 is 13432104421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12440123431 - 2¹¹ = 12440121383 is a prime.

It is a super-2 number, since 2×12440123431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12440123396 and 12440123405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12440123411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220061715 + 6220061716.

It is an arithmetic number, because the mean of its divisors is an integer number (6220061716).

Almost surely, 2^12440123431 is an apocalyptic number.

12440123431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440123431 is an equidigital number, since it uses as much as digits as its factorization.

12440123431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 12440123431 its reverse (13432104421), we get a palindrome (25872227852).

The spelling of 12440123431 in words is "twelve billion, four hundred forty million, one hundred twenty-three thousand, four hundred thirty-one".