11805439887 has 6 divisors (see below), whose sum is σ = 17052302072. Its totient is φ = 7870293252.

The previous prime is 11805439883. The next prime is 11805439889. The reversal of 11805439887 is 78893450811.

11805439887 is a `hidden beast` number, since 1 + 1 + 8 + 0 + 543 + 98 + 8 + 7 = 666.

It is not a de Polignac number, because 11805439887 - 2² = 11805439883 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 (11805439883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 655857763 + ... + 655857780.

Almost surely, 2^11805439887 is an apocalyptic number.

11805439887 is a deficient number, since it is larger than the sum of its proper divisors (5246862185).

11805439887 is a wasteful number, since it uses less digits than its factorization.

11805439887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311715549 (or 1311715546 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 11805439887 in words is "eleven billion, eight hundred five million, four hundred thirty-nine thousand, eight hundred eighty-seven".