11539893987 has 10 divisors (see below), whose sum is σ = 17238607188. Its totient is φ = 7693262604.

The previous prime is 11539893977. The next prime is 11539894001. The reversal of 11539893987 is 78939893511.

11539893987 is a `hidden beast` number, since 1 + 1 + 539 + 8 + 9 + 3 + 98 + 7 = 666.

It is not a de Polignac number, because 11539893987 - 2²⁰ = 11538845411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11539893977) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 71233833 + ... + 71233994.

Almost surely, 2^11539893987 is an apocalyptic number.

11539893987 is a deficient number, since it is larger than the sum of its proper divisors (5698713201).

11539893987 is an equidigital number, since it uses as much as digits as its factorization.

11539893987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142467839 (or 142467830 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 63.

The spelling of 11539893987 in words is "eleven billion, five hundred thirty-nine million, eight hundred ninety-three thousand, nine hundred eighty-seven".