855689 has 4 divisors (see below), whose sum is σ = 859140. Its totient is φ = 852240.

The previous prime is 855683. The next prime is 855697. The reversal of 855689 is 986558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986558 = 2 ⋅493279.

It can be written as a sum of positive squares in 2 ways, for example, as 60025 + 795664 = 245^2 + 892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855689 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 1322 + ... + 1859.

It is an arithmetic number, because the mean of its divisors is an integer number (214785).

2⁸⁵⁵⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

855689 is a deficient number, since it is larger than the sum of its proper divisors (3451).

855689 is a wasteful number, since it uses less digits than its factorization.

855689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3450.

The product of its digits is 86400, while the sum is 41.

The square root of 855689 is about 925.0345939477. The cubic root of 855689 is about 94.9376876689.

The spelling of 855689 in words is "eight hundred fifty-five thousand, six hundred eighty-nine".