866606 has 8 divisors (see below), whose sum is σ = 1399944. Its totient is φ = 399960.

The previous prime is 866581. The next prime is 866623. The reversal of 866606 is 606668.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct 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 in 3 ways as a sum of consecutive naturals, for example, 16640 + ... + 16691.

It is an arithmetic number, because the mean of its divisors is an integer number (174993).

2⁸⁶⁶⁶⁰⁶ is an apocalyptic number.

866606 is a deficient number, since it is larger than the sum of its proper divisors (533338).

866606 is a wasteful number, since it uses less digits than its factorization.

866606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33346.

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

The square root of 866606 is about 930.9167524543. The cubic root of 866606 is about 95.3397255020.

The spelling of 866606 in words is "eight hundred sixty-six thousand, six hundred six".