685789 has 8 divisors (see below), whose sum is σ = 749952. Its totient is φ = 623280.

The previous prime is 685781. The next prime is 685793. The reversal of 685789 is 987586.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685789 - 2³ = 685781 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552 + ... + 1294.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2⁶⁸⁵⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

685789 is a deficient number, since it is larger than the sum of its proper divisors (64163).

685789 is a wasteful number, since it uses less digits than its factorization.

685789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827.

The product of its digits is 120960, while the sum is 43.

The square root of 685789 is about 828.1237830180. The cubic root of 685789 is about 88.1854302749.

The spelling of 685789 in words is "six hundred eighty-five thousand, seven hundred eighty-nine".