860666 has 4 divisors (see below), whose sum is σ = 1291002. Its totient is φ = 430332.

The previous prime is 860663. The next prime is 860689. The reversal of 860666 is 666068.

It is a happy number.

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., 855625 + 5041 = 925^2 + 71^2 .

It is not an unprimeable number, because it can be changed into a prime (860663) 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 as a sum of consecutive naturals, namely, 215165 + ... + 215168.

2⁸⁶⁰⁶⁶⁶ is an apocalyptic number.

860666 is a deficient number, since it is larger than the sum of its proper divisors (430336).

860666 is a wasteful number, since it uses less digits than its factorization.

860666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430335.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 860666 is about 927.7208631911. The cubic root of 860666 is about 95.1213960541.

The spelling of 860666 in words is "eight hundred sixty thousand, six hundred sixty-six".