1812204 has 36 divisors (see below), whose sum is σ = 4651920. Its totient is φ = 594720.

The previous prime is 1812199. The next prime is 1812227. The reversal of 1812204 is 4022181.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2202 + ... + 2910.

It is an arithmetic number, because the mean of its divisors is an integer number (129220).

2^1812204 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 1812204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2325960).

1812204 is an abundant number, since it is smaller than the sum of its proper divisors (2839716).

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

1812204 is a wasteful number, since it uses less digits than its factorization.

1812204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1812204 is about 1346.1812656548. The cubic root of 1812204 is about 121.9183364623.

Adding to 1812204 its reverse (4022181), we get a palindrome (5834385).

It can be divided in two parts, 1812 and 204, that added together give a triangular number (2016 = T₆₃).

The spelling of 1812204 in words is "one million, eight hundred twelve thousand, two hundred four".