686369 has 4 divisors (see below), whose sum is σ = 688560. Its totient is φ = 684180.

The previous prime is 686363. The next prime is 686417. The reversal of 686369 is 963686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 963686 = 2 ⋅481843.

It is a cyclic number.

It is not a de Polignac number, because 686369 - 2⁴ = 686353 is a prime.

It is a super-2 number, since 2×686369² = 942204808322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527 + ... + 1284.

It is an arithmetic number, because the mean of its divisors is an integer number (172140).

2⁶⁸⁶³⁶⁹ is an apocalyptic number.

It is an amenable number.

686369 is a deficient number, since it is larger than the sum of its proper divisors (2191).

686369 is a wasteful number, since it uses less digits than its factorization.

686369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190.

The product of its digits is 46656, while the sum is 38.

The square root of 686369 is about 828.4738982008. The cubic root of 686369 is about 88.2102839530.

The spelling of 686369 in words is "six hundred eighty-six thousand, three hundred sixty-nine".