1811304 has 48 divisors (see below), whose sum is σ = 5353920. Its totient is φ = 548640.

The previous prime is 1811297. The next prime is 1811321. The reversal of 1811304 is 4031181.

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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 352 + ... + 1935.

It is an arithmetic number, because the mean of its divisors is an integer number (111540).

2^1811304 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 1811304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2676960).

1811304 is an abundant number, since it is smaller than the sum of its proper divisors (3542616).

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

1811304 is a wasteful number, since it uses less digits than its factorization.

1811304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310 (or 2303 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1811304 is about 1345.8469452356. The cubic root of 1811304 is about 121.8981502374.

Adding to 1811304 its reverse (4031181), we get a palindrome (5842485).

It can be divided in two parts, 181 and 1304, that added together give a triangular number (1485 = T₅₄).

The spelling of 1811304 in words is "one million, eight hundred eleven thousand, three hundred four".