13888721439 has 12 divisors (see below), whose sum is σ = 20064797272. Its totient is φ = 9257619600.

The previous prime is 13888721411. The next prime is 13888721443. The reversal of 13888721439 is 93412788831.

It is a happy number.

13888721439 is a `hidden beast` number, since 138 + 8 + 8 + 72 + 1 + 439 = 666.

It is not a de Polignac number, because 13888721439 - 2⁷ = 13888721311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13888721449) 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 in 11 ways as a sum of consecutive naturals, for example, 68332 + ... + 180129.

Almost surely, 2^13888721439 is an apocalyptic number.

13888721439 is a deficient number, since it is larger than the sum of its proper divisors (6176075833).

13888721439 is a wasteful number, since it uses less digits than its factorization.

13888721439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254678 (or 254675 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 13888721439 in words is "thirteen billion, eight hundred eighty-eight million, seven hundred twenty-one thousand, four hundred thirty-nine".