13343840639 has 4 divisors (see below), whose sum is σ = 13425704856. Its totient is φ = 13261976424.

The previous prime is 13343840569. The next prime is 13343840659. The reversal of 13343840639 is 93604834331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13343840639 - 2¹² = 13343836543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13343840639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13343840659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40931864 + ... + 40932189.

It is an arithmetic number, because the mean of its divisors is an integer number (3356426214).

Almost surely, 2^13343840639 is an apocalyptic number.

13343840639 is a deficient number, since it is larger than the sum of its proper divisors (81864217).

13343840639 is an equidigital number, since it uses as much as digits as its factorization.

13343840639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81864216.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 13343840639 in words is "thirteen billion, three hundred forty-three million, eight hundred forty thousand, six hundred thirty-nine".