866666 has 8 divisors (see below), whose sum is σ = 1368480. Its totient is φ = 410508.

The previous prime is 866653. The next prime is 866683. The reversal of 866666 is 666668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×866666² = 1502219911112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 22807 = 866666 / (8 + 6 + 6 + 6 + 6 + 6).

866666 is a modest number, since divided by 6666 gives 86 as remainder.

It is a nialpdrome in base 10.

It is an unprimeable number.

866666 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 11366 + ... + 11441.

It is an arithmetic number, because the mean of its divisors is an integer number (171060).

2⁸⁶⁶⁶⁶⁶ is an apocalyptic number.

866666 is a deficient number, since it is larger than the sum of its proper divisors (501814).

866666 is a wasteful number, since it uses less digits than its factorization.

866666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22828.

The product of its digits is 62208, while the sum is 38.

The square root of 866666 is about 930.9489781938. The cubic root of 866666 is about 95.3419257528.

The spelling of 866666 in words is "eight hundred sixty-six thousand, six hundred sixty-six".