13947789987 has 12 divisors (see below), whose sum is σ = 20615338744. Its totient is φ = 9082281600.

The previous prime is 13947789943. The next prime is 13947790001. The reversal of 13947789987 is 78998774931.

13947789987 is a `hidden beast` number, since 1 + 394 + 7 + 78 + 99 + 87 = 666.

It is not a de Polignac number, because 13947789987 - 2¹⁶ = 13947724451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13947789907) 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, 18020014 + ... + 18020787.

Almost surely, 2^13947789987 is an apocalyptic number.

13947789987 is a deficient number, since it is larger than the sum of its proper divisors (6667548757).

13947789987 is a wasteful number, since it uses less digits than its factorization.

13947789987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36040850 (or 36040847 counting only the distinct ones).

The product of its digits is 192036096, while the sum is 72.

The spelling of 13947789987 in words is "thirteen billion, nine hundred forty-seven million, seven hundred eighty-nine thousand, nine hundred eighty-seven".