685943 has 4 divisors (see below), whose sum is σ = 704520. Its totient is φ = 667368.

The previous prime is 685939. The next prime is 685963. The reversal of 685943 is 349586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685943 - 2² = 685939 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685963) 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, 9233 + ... + 9306.

It is an arithmetic number, because the mean of its divisors is an integer number (176130).

2⁶⁸⁵⁹⁴³ is an apocalyptic number.

685943 is a deficient number, since it is larger than the sum of its proper divisors (18577).

685943 is a wasteful number, since it uses less digits than its factorization.

685943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18576.

The product of its digits is 25920, while the sum is 35.

The square root of 685943 is about 828.2167590673. The cubic root of 685943 is about 88.1920307209.

The spelling of 685943 in words is "six hundred eighty-five thousand, nine hundred forty-three".