845685 has 12 divisors (see below), whose sum is σ = 1465932. Its totient is φ = 451008.

The previous prime is 845683. The next prime is 845717. The reversal of 845685 is 586548.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 463761 + 381924 = 681^2 + 618^2 .

It is not a de Polignac number, because 845685 - 2¹ = 845683 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9352 + ... + 9441.

It is an arithmetic number, because the mean of its divisors is an integer number (122161).

2⁸⁴⁵⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

845685 is a deficient number, since it is larger than the sum of its proper divisors (620247).

845685 is a wasteful number, since it uses less digits than its factorization.

845685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18804 (or 18801 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 845685 is about 919.6113309437. The cubic root of 845685 is about 94.5662590659.

The spelling of 845685 in words is "eight hundred forty-five thousand, six hundred eighty-five".