858085 has 4 divisors (see below), whose sum is σ = 1029708. Its totient is φ = 686464.

The previous prime is 858083. The next prime is 858101. The reversal of 858085 is 580858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580858 = 2 ⋅290429.

It can be written as a sum of positive squares in 2 ways, for example, as 487204 + 370881 = 698^2 + 609^2 .

It is a cyclic number.

It is not a de Polignac number, because 858085 - 2¹ = 858083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 858085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858083) 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, 85804 + ... + 85813.

It is an arithmetic number, because the mean of its divisors is an integer number (257427).

2⁸⁵⁸⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

858085 is a deficient number, since it is larger than the sum of its proper divisors (171623).

858085 is a wasteful number, since it uses less digits than its factorization.

858085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171622.

The product of its (nonzero) digits is 12800, while the sum is 34.

The square root of 858085 is about 926.3287753276. The cubic root of 858085 is about 95.0262162181.

The spelling of 858085 in words is "eight hundred fifty-eight thousand, eighty-five".