866687 has 4 divisors (see below), whose sum is σ = 868560. Its totient is φ = 864816.

The previous prime is 866683. The next prime is 866689. The reversal of 866687 is 786668.

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

It is a cyclic number.

It is not a de Polignac number, because 866687 - 2² = 866683 is a prime.

It is a super-2 number, since 2×866687² = 1502292711938, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8 + 6⁴ + 6⁴ + 6⁵ + 8⁵ + 7⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323 + ... + 1355.

It is an arithmetic number, because the mean of its divisors is an integer number (217140).

2⁸⁶⁶⁶⁸⁷ is an apocalyptic number.

866687 is a deficient number, since it is larger than the sum of its proper divisors (1873).

866687 is a wasteful number, since it uses less digits than its factorization.

866687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872.

The product of its digits is 96768, while the sum is 41.

The square root of 866687 is about 930.9602569390. The cubic root of 866687 is about 95.3426958166.

The spelling of 866687 in words is "eight hundred sixty-six thousand, six hundred eighty-seven".