1809104 has 40 divisors (see below), whose sum is σ = 4032480. Its totient is φ = 777600.

The previous prime is 1809097. The next prime is 1809113. The reversal of 1809104 is 4019081.

It is a self number, because there is not a number n which added to its sum of digits gives 1809104.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3074 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (100812).

2^1809104 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 1809104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2016240).

1809104 is an abundant number, since it is smaller than the sum of its proper divisors (2223376).

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

1809104 is a wasteful number, since it uses less digits than its factorization.

1809104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1809104 is about 1345.0293677091. The cubic root of 1809104 is about 121.8487779659.

Subtracting from 1809104 its sum of digits (23), we obtain a palindrome (1809081).

The spelling of 1809104 in words is "one million, eight hundred nine thousand, one hundred four".