858438 has 40 divisors (see below), whose sum is σ = 2201232. Its totient is φ = 244944.

The previous prime is 858433. The next prime is 858457. The reversal of 858438 is 834858.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858433) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 756 + ... + 1512.

2⁸⁵⁸⁴³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 858438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100616).

858438 is an abundant number, since it is smaller than the sum of its proper divisors (1342794).

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

858438 is a wasteful number, since it uses less digits than its factorization.

858438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 769 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 858438 is about 926.5192928374. The cubic root of 858438 is about 95.0392450965.

It can be divided in two parts, 858 and 438, that added together give a 4-th power (1296 = 6⁴).

The spelling of 858438 in words is "eight hundred fifty-eight thousand, four hundred thirty-eight".