870861 has 8 divisors (see below), whose sum is σ = 1165984. Its totient is φ = 578160.

The previous prime is 870853. The next prime is 870871. The reversal of 870861 is 168078.

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

It is not a de Polignac number, because 870861 - 2³ = 870853 is a prime.

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 (870811) 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 7 ways as a sum of consecutive naturals, for example, 555 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (145748).

2⁸⁷⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

870861 is a deficient number, since it is larger than the sum of its proper divisors (295123).

870861 is a wasteful number, since it uses less digits than its factorization.

870861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 870861 is about 933.1993356191. The cubic root of 870861 is about 95.4955088666.

The spelling of 870861 in words is "eight hundred seventy thousand, eight hundred sixty-one".