685829 has 4 divisors (see below), whose sum is σ = 694176. Its totient is φ = 677484.

The previous prime is 685819. The next prime is 685849. The reversal of 685829 is 928586.

685829 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685829 is a prime.

It is a super-3 number, since 3×685829³ = 967762501274933367, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685792 and 685801.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685829.

It is not an unprimeable number, because it can be changed into a prime (685819) 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, 4049 + ... + 4214.

It is an arithmetic number, because the mean of its divisors is an integer number (173544).

2⁶⁸⁵⁸²⁹ is an apocalyptic number.

It is an amenable number.

685829 is a deficient number, since it is larger than the sum of its proper divisors (8347).

685829 is an equidigital number, since it uses as much as digits as its factorization.

685829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346.

The product of its digits is 34560, while the sum is 38.

The square root of 685829 is about 828.1479336447. The cubic root of 685829 is about 88.1871447714.

The spelling of 685829 in words is "six hundred eighty-five thousand, eight hundred twenty-nine".