1804 has 12 divisors (see below), whose sum is σ = 3528. Its totient is φ = 800.

The previous prime is 1801. The next prime is 1811. The reversal of 1804 is 4081.

1804 = T₁₁ + T₁₂ + ... + T₂₂.

1804 is nontrivially palindromic in base 13.

1804 is an undulating number in base 9 and base 13.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24 + ... + 64.

It is an arithmetic number, because the mean of its divisors is an integer number (294).

2¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

1804 is a deficient number, since it is larger than the sum of its proper divisors (1724).

1804 is a wasteful number, since it uses less digits than its factorization.

1804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1804 is about 42.4735211632. The cubic root of 1804 is about 12.1734079944.

Adding to 1804 its reverse (4081), we get a palindrome (5885).

The spelling of 1804 in words is "one thousand, eight hundred four".