866423 has 4 divisors (see below), whose sum is σ = 868608. Its totient is φ = 864240.

The previous prime is 866417. The next prime is 866431. The reversal of 866423 is 324668.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866423 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866443) 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, 311 + ... + 1352.

It is an arithmetic number, because the mean of its divisors is an integer number (217152).

2⁸⁶⁶⁴²³ is an apocalyptic number.

866423 is a deficient number, since it is larger than the sum of its proper divisors (2185).

866423 is a wasteful number, since it uses less digits than its factorization.

866423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184.

The product of its digits is 6912, while the sum is 29.

The square root of 866423 is about 930.8184570581. The cubic root of 866423 is about 95.3330141099. Note that the first 3 decimals are identical.

The spelling of 866423 in words is "eight hundred sixty-six thousand, four hundred twenty-three".