686397843 has 12 divisors (see below), whose sum is σ = 991692000. Its totient is φ = 457493136.

The previous prime is 686397779. The next prime is 686397923. The reversal of 686397843 is 348793686.

686397843 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 686397843 - 2⁶ = 686397779 is a prime.

It is a super-2 number, since 2×686397843² = 942283997750105298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 686397843.

It is not an unprimeable number, because it can be changed into a prime (686397343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65533 + ... + 75281.

It is an arithmetic number, because the mean of its divisors is an integer number (82641000).

Almost surely, 2^686397843 is an apocalyptic number.

686397843 is a deficient number, since it is larger than the sum of its proper divisors (305294157).

686397843 is a wasteful number, since it uses less digits than its factorization.

686397843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17578 (or 17575 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 686397843 is about 26199.1954647466. The cubic root of 686397843 is about 882.1151954373.

The spelling of 686397843 in words is "six hundred eighty-six million, three hundred ninety-seven thousand, eight hundred forty-three".