858489 has 4 divisors (see below), whose sum is σ = 1144656. Its totient is φ = 572324.

The previous prime is 858479. The next prime is 858497. The reversal of 858489 is 984858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 858489 - 2⁵ = 858457 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 858489.

It is not an unprimeable number, because it can be changed into a prime (858479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143079 + ... + 143084.

It is an arithmetic number, because the mean of its divisors is an integer number (286164).

2⁸⁵⁸⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

858489 is a deficient number, since it is larger than the sum of its proper divisors (286167).

858489 is a wasteful number, since it uses less digits than its factorization.

858489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286166.

The product of its digits is 92160, while the sum is 42.

The square root of 858489 is about 926.5468147914. The cubic root of 858489 is about 95.0411271604.

The spelling of 858489 in words is "eight hundred fifty-eight thousand, four hundred eighty-nine".