859986 has 12 divisors (see below), whose sum is σ = 1863342. Its totient is φ = 286656.

The previous prime is 859981. The next prime is 859987. The reversal of 859986 is 689958.

It can be written as a sum of positive squares in only one way, i.e., 670761 + 189225 = 819^2 + 435^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859981) 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 5 ways as a sum of consecutive naturals, for example, 23871 + ... + 23906.

2⁸⁵⁹⁹⁸⁶ is an apocalyptic number.

859986 is an abundant number, since it is smaller than the sum of its proper divisors (1003356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

859986 is a wasteful number, since it uses less digits than its factorization.

859986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47785 (or 47782 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 859986 is about 927.3543012247. The cubic root of 859986 is about 95.0963380983.

The spelling of 859986 in words is "eight hundred fifty-nine thousand, nine hundred eighty-six".