686851983 has 6 divisors (see below), whose sum is σ = 992119544. Its totient is φ = 457901316.

The previous prime is 686851961. The next prime is 686851993. The reversal of 686851983 is 389158686.

686851983 is a `hidden beast` number, since 68 + 68 + 519 + 8 + 3 = 666.

686851983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686851983 - 2⁵ = 686851951 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 (686851993) 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, 38158435 + ... + 38158452.

Almost surely, 2^686851983 is an apocalyptic number.

686851983 is a deficient number, since it is larger than the sum of its proper divisors (305267561).

686851983 is a wasteful number, since it uses less digits than its factorization.

686851983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76316893 (or 76316890 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 686851983 is about 26207.8610916648. The cubic root of 686851983 is about 882.3096965716.

The spelling of 686851983 in words is "six hundred eighty-six million, eight hundred fifty-one thousand, nine hundred eighty-three".