686329 has 4 divisors (see below), whose sum is σ = 784384. Its totient is φ = 588276.

The previous prime is 686321. The next prime is 686333. The reversal of 686329 is 923686.

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: 923686 = 2 ⋅461843.

It is a cyclic number.

It is not a de Polignac number, because 686329 - 2³ = 686321 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 686294 and 686303.

It is not an unprimeable number, because it can be changed into a prime (686321) 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, 49017 + ... + 49030.

It is an arithmetic number, because the mean of its divisors is an integer number (196096).

2⁶⁸⁶³²⁹ is an apocalyptic number.

It is an amenable number.

686329 is a deficient number, since it is larger than the sum of its proper divisors (98055).

686329 is an equidigital number, since it uses as much as digits as its factorization.

686329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98054.

The product of its digits is 15552, while the sum is 34.

The square root of 686329 is about 828.4497570764. The cubic root of 686329 is about 88.2085703558.

The spelling of 686329 in words is "six hundred eighty-six thousand, three hundred twenty-nine".