861285 has 16 divisors (see below), whose sum is σ = 1400256. Its totient is φ = 451968.

The previous prime is 861239. The next prime is 861293. The reversal of 861285 is 582168.

It is not a de Polignac number, because 861285 - 2⁶ = 861221 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577 + ... + 1433.

It is an arithmetic number, because the mean of its divisors is an integer number (87516).

2⁸⁶¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

861285 is a deficient number, since it is larger than the sum of its proper divisors (538971).

861285 is a wasteful number, since it uses less digits than its factorization.

861285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932.

The product of its digits is 3840, while the sum is 30.

The square root of 861285 is about 928.0544165080. The cubic root of 861285 is about 95.1441946907.

The spelling of 861285 in words is "eight hundred sixty-one thousand, two hundred eighty-five".