864686 has 4 divisors (see below), whose sum is σ = 1297032. Its totient is φ = 432342.

The previous prime is 864679. The next prime is 864691. The reversal of 864686 is 686468.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 216170 + ... + 216173.

It is an arithmetic number, because the mean of its divisors is an integer number (324258).

2⁸⁶⁴⁶⁸⁶ is an apocalyptic number.

864686 is a deficient number, since it is larger than the sum of its proper divisors (432346).

864686 is a wasteful number, since it uses less digits than its factorization.

864686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432345.

The product of its digits is 55296, while the sum is 38.

The square root of 864686 is about 929.8849391188. The cubic root of 864686 is about 95.2692637904.

It can be divided in two parts, 864 and 686, that multiplied together give a cube (592704 = 84³).

The spelling of 864686 in words is "eight hundred sixty-four thousand, six hundred eighty-six".