685783 has 6 divisors (see below), whose sum is σ = 786264. Its totient is φ = 585936.

The previous prime is 685781. The next prime is 685793. The reversal of 685783 is 387586.

It is not a de Polignac number, because 685783 - 2¹ = 685781 is a prime.

It is an Ulam number.

It is a Duffinian number.

Its product of digits (40320) is a multiple of the sum of its prime divisors (320).

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 5 ways as a sum of consecutive naturals, for example, 2035 + ... + 2347.

It is an arithmetic number, because the mean of its divisors is an integer number (131044).

2⁶⁸⁵⁷⁸³ is an apocalyptic number.

685783 is a deficient number, since it is larger than the sum of its proper divisors (100481).

685783 is an frugal number, since it uses more digits than its factorization.

685783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 320 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 685783 is about 828.1201603632. The cubic root of 685783 is about 88.1851730946.

The spelling of 685783 in words is "six hundred eighty-five thousand, seven hundred eighty-three".