10340440391 has 2 divisors, whose sum is σ = 10340440392. Its totient is φ = 10340440390.

The previous prime is 10340440387. The next prime is 10340440403. The reversal of 10340440391 is 19304404301.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10340440391 - 2² = 10340440387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10340445391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5170220195 + 5170220196.

It is an arithmetic number, because the mean of its divisors is an integer number (5170220196).

Almost surely, 2^10340440391 is an apocalyptic number.

10340440391 is a deficient number, since it is larger than the sum of its proper divisors (1).

10340440391 is an equidigital number, since it uses as much as digits as its factorization.

10340440391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 10340440391 its reverse (19304404301), we get a palindrome (29644844692).

The spelling of 10340440391 in words is "ten billion, three hundred forty million, four hundred forty thousand, three hundred ninety-one".