686693859 has 4 divisors (see below), whose sum is σ = 915591816. Its totient is φ = 457795904.

The previous prime is 686693837. The next prime is 686693873. The reversal of 686693859 is 958396686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686693859 - 2⁸ = 686693603 is a prime.

It is a super-3 number, since 3×686693859³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (686693899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114448974 + ... + 114448979.

It is an arithmetic number, because the mean of its divisors is an integer number (228897954).

Almost surely, 2^686693859 is an apocalyptic number.

686693859 is a deficient number, since it is larger than the sum of its proper divisors (228897957).

686693859 is a wasteful number, since it uses less digits than its factorization.

686693859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228897956.

The product of its digits is 16796160, while the sum is 60.

The square root of 686693859 is about 26204.8441895769. The cubic root of 686693859 is about 882.2419842408.

The spelling of 686693859 in words is "six hundred eighty-six million, six hundred ninety-three thousand, eight hundred fifty-nine".