• 858 can be written using four 4's:
858 is nontrivially palindromic in base 10, base 14 and base 15.
858 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between even and odd.
858 is an undulating number in base 10, base 14 and base 15.
It is a plaindrome in base 7 and base 16.
It is a nialpdrome in base 11 and base 13.
858 is a Giuga number.
It is a practical number, because each smaller number is the sum of distinct divisors of 858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
858 is a wasteful number, since it uses less digits than its factorization.
858 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 29.
The square root of 858 is about 29.2916370318. The cubic root of 858 is about 9.5023078419.