870085 has 4 divisors (see below), whose sum is σ = 1044108. Its totient is φ = 696064.

The previous prime is 870083. The next prime is 870097. The reversal of 870085 is 580078.

870085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580078 = 2 ⋅290039.

It can be written as a sum of positive squares in 2 ways, for example, as 641601 + 228484 = 801^2 + 478^2 .

It is a cyclic number.

It is not a de Polignac number, because 870085 - 2¹ = 870083 is a prime.

It is a Duffinian number.

870085 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870083) 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, 87004 + ... + 87013.

It is an arithmetic number, because the mean of its divisors is an integer number (261027).

2⁸⁷⁰⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

870085 is a deficient number, since it is larger than the sum of its proper divisors (174023).

870085 is a wasteful number, since it uses less digits than its factorization.

870085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174022.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 870085 is about 932.7834689787. The cubic root of 870085 is about 95.4671359741.

The spelling of 870085 in words is "eight hundred seventy thousand, eighty-five".