855558 has 48 divisors (see below), whose sum is σ = 2106000. Its totient is φ = 248640.

The previous prime is 855527. The next prime is 855581.

855558 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×855558³ = 1878752729017203336, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5668 + ... + 5816.

It is an arithmetic number, because the mean of its divisors is an integer number (43875).

2⁸⁵⁵⁵⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053000).

855558 is an abundant number, since it is smaller than the sum of its proper divisors (1250442).

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

855558 is a wasteful number, since it uses less digits than its factorization.

855558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 194 counting only the distinct ones).

The product of its digits is 40000, while the sum is 36.

The square root of 855558 is about 924.9637830748. The cubic root of 855558 is about 94.9328426564.

The spelling of 855558 in words is "eight hundred fifty-five thousand, five hundred fifty-eight".