12440388431 has 2 divisors, whose sum is σ = 12440388432. Its totient is φ = 12440388430.

The previous prime is 12440388421. The next prime is 12440388449. The reversal of 12440388431 is 13488304421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12440388431 is a prime.

It is a super-2 number, since 2×12440388431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12440388421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220194215 + 6220194216.

It is an arithmetic number, because the mean of its divisors is an integer number (6220194216).

Almost surely, 2^12440388431 is an apocalyptic number.

12440388431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440388431 is an equidigital number, since it uses as much as digits as its factorization.

12440388431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 12440388431 in words is "twelve billion, four hundred forty million, three hundred eighty-eight thousand, four hundred thirty-one".