866988 has 18 divisors (see below), whose sum is σ = 2191644. Its totient is φ = 288984.

The previous prime is 866969. The next prime is 867001. The reversal of 866988 is 889668.

It is a tau number, because it is divible by the number of its divisors (18).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866988.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12006 + ... + 12077.

It is an arithmetic number, because the mean of its divisors is an integer number (121758).

2⁸⁶⁶⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

866988 is an abundant number, since it is smaller than the sum of its proper divisors (1324656).

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

866988 is a wasteful number, since it uses less digits than its factorization.

866988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24093 (or 24088 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 866988 is about 931.1219039417. The cubic root of 866988 is about 95.3537320306.

The spelling of 866988 in words is "eight hundred sixty-six thousand, nine hundred eighty-eight".