858855 has 16 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 443040.

The previous prime is 858841. The next prime is 858859. The reversal of 858855 is 558858.

It is not a de Polignac number, because 858855 - 2¹⁵ = 826087 is a prime.

It is a super-2 number, since 2×858855² = 1475263822050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459 + ... + 1388.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2⁸⁵⁸⁸⁵⁵ is an apocalyptic number.

858855 is a deficient number, since it is larger than the sum of its proper divisors (560409).

858855 is a wasteful number, since it uses less digits than its factorization.

858855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886.

The product of its digits is 64000, while the sum is 39.

The square root of 858855 is about 926.7443013043. The cubic root of 858855 is about 95.0546315503.

The spelling of 858855 in words is "eight hundred fifty-eight thousand, eight hundred fifty-five".