855520 has 24 divisors (see below), whose sum is σ = 2021544. Its totient is φ = 342144.

The previous prime is 855511. The next prime is 855521. The reversal of 855520 is 25558.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855521) 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, 2514 + ... + 2833.

It is an arithmetic number, because the mean of its divisors is an integer number (84231).

2⁸⁵⁵⁵²⁰ is an apocalyptic number.

855520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

855520 is an abundant number, since it is smaller than the sum of its proper divisors (1166024).

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

855520 is a wasteful number, since it uses less digits than its factorization.

855520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362 (or 5354 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 855520 is about 924.9432415019. The cubic root of 855520 is about 94.9314371404.

The spelling of 855520 in words is "eight hundred fifty-five thousand, five hundred twenty".