855856 has 20 divisors (see below), whose sum is σ = 1674000. Its totient is φ = 423872.

The previous prime is 855851. The next prime is 855857. The reversal of 855856 is 658558.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (855851) 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, 2205 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2⁸⁵⁵⁸⁵⁶ is an apocalyptic number.

855856 is the 495-th centered heptagonal number.

It is an amenable number.

855856 is a deficient number, since it is larger than the sum of its proper divisors (818144).

855856 is a wasteful number, since it uses less digits than its factorization.

855856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 510 counting only the distinct ones).

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

The square root of 855856 is about 925.1248564383. The cubic root of 855856 is about 94.9438634184.

It can be divided in two parts, 855 and 856, that added together give a triangular number (1711 = T₅₈).

The spelling of 855856 in words is "eight hundred fifty-five thousand, eight hundred fifty-six".