855920 has 40 divisors (see below), whose sum is σ = 2145696. Its totient is φ = 315648.

The previous prime is 855919. The next prime is 855923. The reversal of 855920 is 29558.

855920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855923) 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, 629 + ... + 1451.

2⁸⁵⁵⁹²⁰ is an apocalyptic number.

855920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072848).

855920 is an abundant number, since it is smaller than the sum of its proper divisors (1289776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855920 is a wasteful number, since it uses less digits than its factorization.

855920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 855920 is about 925.1594457173. The cubic root of 855920 is about 94.9462299597.

The spelling of 855920 in words is "eight hundred fifty-five thousand, nine hundred twenty".