866220 has 24 divisors (see below), whose sum is σ = 2425584. Its totient is φ = 230976.

The previous prime is 866213. The next prime is 866221. The reversal of 866220 is 22668.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (866221) 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, 7159 + ... + 7278.

It is an arithmetic number, because the mean of its divisors is an integer number (101066).

2⁸⁶⁶²²⁰ is an apocalyptic number.

It is an amenable number.

866220 is an abundant number, since it is smaller than the sum of its proper divisors (1559364).

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

866220 is a wasteful number, since it uses less digits than its factorization.

866220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14449 (or 14447 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 866220 is about 930.7094068505. The cubic root of 866220 is about 95.3255681267.

Adding to 866220 its reverse (22668), we get a palindrome (888888).

The spelling of 866220 in words is "eight hundred sixty-six thousand, two hundred twenty".