864866 has 4 divisors (see below), whose sum is σ = 1297302. Its totient is φ = 432432.

The previous prime is 864817. The next prime is 864883. The reversal of 864866 is 668468.

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

It can be written as a sum of positive squares in only one way, i.e., 469225 + 395641 = 685^2 + 629^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216215 + ... + 216218.

2⁸⁶⁴⁸⁶⁶ is an apocalyptic number.

864866 is a deficient number, since it is larger than the sum of its proper divisors (432436).

864866 is a wasteful number, since it uses less digits than its factorization.

864866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432435.

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

The square root of 864866 is about 929.9817202505. The cubic root of 864866 is about 95.2758740041.

The spelling of 864866 in words is "eight hundred sixty-four thousand, eight hundred sixty-six".