812189 has 4 divisors (see below), whose sum is σ = 928224. Its totient is φ = 696156.

The previous prime is 812183. The next prime is 812191. The reversal of 812189 is 981218.

812189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 812189 - 2⁴ = 812173 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812183) 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, 58007 + ... + 58020.

It is an arithmetic number, because the mean of its divisors is an integer number (232056).

2⁸¹²¹⁸⁹ is an apocalyptic number.

It is an amenable number.

812189 is a deficient number, since it is larger than the sum of its proper divisors (116035).

812189 is a wasteful number, since it uses less digits than its factorization.

812189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116034.

The product of its digits is 1152, while the sum is 29.

The square root of 812189 is about 901.2152905938. The cubic root of 812189 is about 93.3008716475.

Adding to 812189 its sum of digits (29), we get a palindrome (812218).

It can be divided in two parts, 812 and 189, that added together give a palindrome (1001).

The spelling of 812189 in words is "eight hundred twelve thousand, one hundred eighty-nine".