812220 has 24 divisors (see below), whose sum is σ = 2274384. Its totient is φ = 216576.

The previous prime is 812213. The next prime is 812221. The reversal of 812220 is 22218.

812220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 812220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812221) by changing a digit.

812220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6709 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (94766).

2⁸¹²²²⁰ is an apocalyptic number.

It is an amenable number.

812220 is an abundant number, since it is smaller than the sum of its proper divisors (1462164).

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

812220 is a wasteful number, since it uses less digits than its factorization.

812220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13549 (or 13547 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 812220 is about 901.2324894277. The cubic root of 812220 is about 93.3020586825.

Adding to 812220 its reverse (22218), we get a palindrome (834438).

The spelling of 812220 in words is "eight hundred twelve thousand, two hundred twenty".