861386 has 8 divisors (see below), whose sum is σ = 1300320. Its totient is φ = 427948.

The previous prime is 861361. The next prime is 861391. The reversal of 861386 is 683168.

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

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956 + ... + 1623.

It is an arithmetic number, because the mean of its divisors is an integer number (162540).

2⁸⁶¹³⁸⁶ is an apocalyptic number.

861386 is a deficient number, since it is larger than the sum of its proper divisors (438934).

861386 is a wasteful number, since it uses less digits than its factorization.

861386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748.

The product of its digits is 6912, while the sum is 32.

The square root of 861386 is about 928.1088298255. The cubic root of 861386 is about 95.1479136254.

The spelling of 861386 in words is "eight hundred sixty-one thousand, three hundred eighty-six".