685207 has 4 divisors (see below), whose sum is σ = 686880. Its totient is φ = 683536.

The previous prime is 685199. The next prime is 685231. The reversal of 685207 is 702586.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 702586 = 2 ⋅351293.

It is a cyclic number.

It is not a de Polignac number, because 685207 - 2³ = 685199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243 + ... + 1195.

It is an arithmetic number, because the mean of its divisors is an integer number (171720).

2⁶⁸⁵²⁰⁷ is an apocalyptic number.

685207 is a deficient number, since it is larger than the sum of its proper divisors (1673).

685207 is an equidigital number, since it uses as much as digits as its factorization.

685207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 685207 is about 827.7723116896. The cubic root of 685207 is about 88.1604768047.

The spelling of 685207 in words is "six hundred eighty-five thousand, two hundred seven".