866380 has 12 divisors (see below), whose sum is σ = 1819440. Its totient is φ = 346544.

The previous prime is 866353. The next prime is 866389. The reversal of 866380 is 83668.

It is a super-2 number, since 2×866380² = 1501228608800, which contains 22 as substring.

It is a plaindrome in base 13.

It is a zygodrome in base 3.

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, 21640 + ... + 21679.

It is an arithmetic number, because the mean of its divisors is an integer number (151620).

2⁸⁶⁶³⁸⁰ is an apocalyptic number.

It is an amenable number.

866380 is an abundant number, since it is smaller than the sum of its proper divisors (953060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866380 is a wasteful number, since it uses less digits than its factorization.

866380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43328 (or 43326 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 866380 is about 930.7953588195. The cubic root of 866380 is about 95.3314369790.

The spelling of 866380 in words is "eight hundred sixty-six thousand, three hundred eighty".