1804404 has 24 divisors (see below), whose sum is σ = 4811968. Its totient is φ = 515520.

The previous prime is 1804403. The next prime is 1804421. The reversal of 1804404 is 4044081.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10657 + ... + 10824.

2^1804404 is an apocalyptic number.

1804404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1804404 is an abundant number, since it is smaller than the sum of its proper divisors (3007564).

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

1804404 is a wasteful number, since it uses less digits than its factorization.

1804404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21495 (or 21493 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1804404 is about 1343.2810577091. The cubic root of 1804404 is about 121.7431665846.

Adding to 1804404 its reverse (4044081), we get a palindrome (5848485).

The spelling of 1804404 in words is "one million, eight hundred four thousand, four hundred four".