858420 has 72 divisors (see below), whose sum is σ = 2751840. Its totient is φ = 216000.

The previous prime is 858397. The next prime is 858427. The reversal of 858420 is 24858.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3295 + ... + 3545.

It is an arithmetic number, because the mean of its divisors is an integer number (38220).

2⁸⁵⁸⁴²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 858420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375920).

858420 is an abundant number, since it is smaller than the sum of its proper divisors (1893420).

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

858420 is a wasteful number, since it uses less digits than its factorization.

858420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 858420 is about 926.5095790115. The cubic root of 858420 is about 95.0385808209.

The spelling of 858420 in words is "eight hundred fifty-eight thousand, four hundred twenty".