866920 has 16 divisors (see below), whose sum is σ = 1950660. Its totient is φ = 346752.

The previous prime is 866917. The next prime is 866927. The reversal of 866920 is 29668.

866920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 806404 + 60516 = 898^2 + 246^2 .

It is not an unprimeable number, because it can be changed into a prime (866927) 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, 10797 + ... + 10876.

2⁸⁶⁶⁹²⁰ is an apocalyptic number.

It is an amenable number.

866920 is an abundant number, since it is smaller than the sum of its proper divisors (1083740).

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

866920 is a wasteful number, since it uses less digits than its factorization.

866920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21684 (or 21680 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 866920 is about 931.0853881358. The cubic root of 866920 is about 95.3512390229.

The spelling of 866920 in words is "eight hundred sixty-six thousand, nine hundred twenty".