685156 has 12 divisors (see below), whose sum is σ = 1211392. Its totient is φ = 339048.

The previous prime is 685141. The next prime is 685169. The reversal of 685156 is 651586.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420 + ... + 1243.

2⁶⁸⁵¹⁵⁶ is an apocalyptic number.

It is an amenable number.

685156 is a deficient number, since it is larger than the sum of its proper divisors (526236).

685156 is a wasteful number, since it uses less digits than its factorization.

685156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770 (or 1768 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 685156 is about 827.7415055439. The cubic root of 685156 is about 88.1582894872.

It can be divided in two parts, 685 and 156, that added together give a square (841 = 29²).

The spelling of 685156 in words is "six hundred eighty-five thousand, one hundred fifty-six".