866384 has 20 divisors (see below), whose sum is σ = 1693716. Its totient is φ = 429312.

The previous prime is 866353. The next prime is 866389. The reversal of 866384 is 483668.

It can be written as a sum of positive squares in 2 ways, for example, as 336400 + 529984 = 580^2 + 728^2 .

It is a super-3 number, since 3×866384³ = 1950978685377933312, which contains 333 as substring.

It is a plaindrome in base 13.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866389) 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, 2612 + ... + 2924.

2⁸⁶⁶³⁸⁴ is an apocalyptic number.

It is an amenable number.

866384 is a deficient number, since it is larger than the sum of its proper divisors (827332).

866384 is a wasteful number, since it uses less digits than its factorization.

866384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 488 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 866384 is about 930.7975075171. The cubic root of 866384 is about 95.3315836911.

The spelling of 866384 in words is "eight hundred sixty-six thousand, three hundred eighty-four".