13840343939 has 2 divisors, whose sum is σ = 13840343940. Its totient is φ = 13840343938.

The previous prime is 13840343921. The next prime is 13840343981. The reversal of 13840343939 is 93934304831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13840343939 - 2⁸ = 13840343683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13840343893 and 13840343902.

It is not a weakly prime, because it can be changed into another prime (13840343339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6920171969 + 6920171970.

It is an arithmetic number, because the mean of its divisors is an integer number (6920171970).

Almost surely, 2^13840343939 is an apocalyptic number.

13840343939 is a deficient number, since it is larger than the sum of its proper divisors (1).

13840343939 is an equidigital number, since it uses as much as digits as its factorization.

13840343939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 47.

The spelling of 13840343939 in words is "thirteen billion, eight hundred forty million, three hundred forty-three thousand, nine hundred thirty-nine".