1800804 has 12 divisors (see below), whose sum is σ = 4201904. Its totient is φ = 600264.

The previous prime is 1800803. The next prime is 1800809. The reversal of 1800804 is 4080081.

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1800803) 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, 75022 + ... + 75045.

2^1800804 is an apocalyptic number.

It is an amenable number.

1800804 is an abundant number, since it is smaller than the sum of its proper divisors (2401100).

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

1800804 is a wasteful number, since it uses less digits than its factorization.

1800804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150074 (or 150072 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 1800804 is about 1341.9403861573. The cubic root of 1800804 is about 121.6621486615.

Adding to 1800804 its reverse (4080081), we get a palindrome (5880885).

The spelling of 1800804 in words is "one million, eight hundred thousand, eight hundred four".