1800404 has 6 divisors (see below), whose sum is σ = 3150714. Its totient is φ = 900200.

The previous prime is 1800401. The next prime is 1800413. The reversal of 1800404 is 4040081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1684804 + 115600 = 1298^2 + 340^2 .

1800404 is a modest number, since divided by 404 gives 180 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225047 + ... + 225054.

It is an arithmetic number, because the mean of its divisors is an integer number (525119).

2^1800404 is an apocalyptic number.

It is an amenable number.

1800404 is a deficient number, since it is larger than the sum of its proper divisors (1350310).

1800404 is a wasteful number, since it uses less digits than its factorization.

1800404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450105 (or 450103 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1800404 is about 1341.7913399631. The cubic root of 1800404 is about 121.6531400070.

Adding to 1800404 its reverse (4040081), we get a palindrome (5840485).

The spelling of 1800404 in words is "one million, eight hundred thousand, four hundred four".