861286 has 16 divisors (see below), whose sum is σ = 1351584. Its totient is φ = 411264.

The previous prime is 861239. The next prime is 861293. The reversal of 861286 is 682168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7566 + ... + 7678.

It is an arithmetic number, because the mean of its divisors is an integer number (84474).

2⁸⁶¹²⁸⁶ is an apocalyptic number.

861286 is a deficient number, since it is larger than the sum of its proper divisors (490298).

861286 is a wasteful number, since it uses less digits than its factorization.

861286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255.

The product of its digits is 4608, while the sum is 31.

The square root of 861286 is about 928.0549552694. The cubic root of 861286 is about 95.1442315133.

The spelling of 861286 in words is "eight hundred sixty-one thousand, two hundred eighty-six".