686365 has 4 divisors (see below), whose sum is σ = 823644. Its totient is φ = 549088.

The previous prime is 686363. The next prime is 686417. The reversal of 686365 is 563686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 480249 + 206116 = 693^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 686365 - 2¹ = 686363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68632 + ... + 68641.

It is an arithmetic number, because the mean of its divisors is an integer number (205911).

2⁶⁸⁶³⁶⁵ is an apocalyptic number.

It is an amenable number.

686365 is a deficient number, since it is larger than the sum of its proper divisors (137279).

686365 is a wasteful number, since it uses less digits than its factorization.

686365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137278.

The product of its digits is 25920, while the sum is 34.

The square root of 686365 is about 828.4714841200. The cubic root of 686365 is about 88.2101125962.

The spelling of 686365 in words is "six hundred eighty-six thousand, three hundred sixty-five".