866904 has 32 divisors (see below), whose sum is σ = 2222640. Its totient is φ = 281600.

The previous prime is 866869. The next prime is 866909. The reversal of 866904 is 409668.

866904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (866909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544 + ... + 1424.

2⁸⁶⁶⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111320).

866904 is an abundant number, since it is smaller than the sum of its proper divisors (1355736).

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

866904 is a wasteful number, since it uses less digits than its factorization.

866904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 866904 is about 931.0767959734. The cubic root of 866904 is about 95.3506524139.

It can be divided in two parts, 866 and 904, that added together give a triangular number (1770 = T₅₉).

The spelling of 866904 in words is "eight hundred sixty-six thousand, nine hundred four".