858869 has 4 divisors (see below), whose sum is σ = 936960. Its totient is φ = 780780.

The previous prime is 858859. The next prime is 858877. The reversal of 858869 is 968858.

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 not a de Polignac number, because 858869 - 2¹⁶ = 793333 is a prime.

It is a super-2 number, since 2×858869² = 1475311918322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39029 + ... + 39050.

It is an arithmetic number, because the mean of its divisors is an integer number (234240).

2⁸⁵⁸⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

858869 is a deficient number, since it is larger than the sum of its proper divisors (78091).

858869 is a wasteful number, since it uses less digits than its factorization.

858869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78090.

The product of its digits is 138240, while the sum is 44.

The square root of 858869 is about 926.7518545976. The cubic root of 858869 is about 95.0551480355.

The spelling of 858869 in words is "eight hundred fifty-eight thousand, eight hundred sixty-nine".