858642 has 8 divisors (see below), whose sum is σ = 1717296. Its totient is φ = 286212.

The previous prime is 858631. The next prime is 858673. The reversal of 858642 is 246858.

It is a sphenic number, since it is the product of 3 distinct primes.

858642 is an admirable number.

It is an unprimeable number.

858642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71548 + ... + 71559.

It is an arithmetic number, because the mean of its divisors is an integer number (214662).

2⁸⁵⁸⁶⁴² is an apocalyptic number.

858642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

858642 is a wasteful number, since it uses less digits than its factorization.

858642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143112.

The product of its digits is 15360, while the sum is 33.

The square root of 858642 is about 926.6293757485. The cubic root of 858642 is about 95.0467729050.

The spelling of 858642 in words is "eight hundred fifty-eight thousand, six hundred forty-two".