855685 has 8 divisors (see below), whose sum is σ = 1046520. Its totient is φ = 671424.

The previous prime is 855683. The next prime is 855697. The reversal of 855685 is 586558.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91809 + 763876 = 303^2 + 874^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 855685 - 2¹ = 855683 is a prime.

It is a super-4 number, since 4×855685⁴ (a number of 25 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1350 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (130815).

2⁸⁵⁵⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

855685 is a deficient number, since it is larger than the sum of its proper divisors (190835).

855685 is a wasteful number, since it uses less digits than its factorization.

855685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3287.

The product of its digits is 48000, while the sum is 37.

The square root of 855685 is about 925.0324318639. The cubic root of 855685 is about 94.9375397369.

It can be divided in two parts, 855 and 685, that added together give a triangular number (1540 = T₅₅).

The spelling of 855685 in words is "eight hundred fifty-five thousand, six hundred eighty-five".