685876 has 6 divisors (see below), whose sum is σ = 1200290. Its totient is φ = 342936.

The previous prime is 685859. The next prime is 685907. The reversal of 685876 is 678586.

It can be written as a sum of positive squares in only one way, i.e., 682276 + 3600 = 826^2 + 60^2 .

It is a nialpdrome in base 7.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 85731 + ... + 85738.

2⁶⁸⁵⁸⁷⁶ is an apocalyptic number.

It is an amenable number.

685876 is a deficient number, since it is larger than the sum of its proper divisors (514414).

685876 is a wasteful number, since it uses less digits than its factorization.

685876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171473 (or 171471 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 685876 is about 828.1763097312. The cubic root of 685876 is about 88.1891592197.

It can be divided in two parts, 685 and 876, that multiplied together give a triangular number (600060 = T₁₀₉₅).

The spelling of 685876 in words is "six hundred eighty-five thousand, eight hundred seventy-six".