866669 has 4 divisors (see below), whose sum is σ = 868896. Its totient is φ = 864444.

The previous prime is 866653. The next prime is 866683. The reversal of 866669 is 966668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866669 - 2⁴ = 866653 is a prime.

It is a super-2 number, since 2×866669² = 1502230311122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866629) 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, 359 + ... + 1364.

It is an arithmetic number, because the mean of its divisors is an integer number (217224).

2⁸⁶⁶⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

866669 is a deficient number, since it is larger than the sum of its proper divisors (2227).

866669 is a wasteful number, since it uses less digits than its factorization.

866669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226.

The product of its digits is 93312, while the sum is 41.

The square root of 866669 is about 930.9505894514. The cubic root of 866669 is about 95.3420357627.

Subtracting 866669 from its reverse (966668), we obtain a palindrome (99999).

The spelling of 866669 in words is "eight hundred sixty-six thousand, six hundred sixty-nine".