1813404 has 24 divisors (see below), whose sum is σ = 4253200. Its totient is φ = 601344.

The previous prime is 1813391. The next prime is 1813421. The reversal of 1813404 is 4043181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3972 + ... + 4404.

2^1813404 is an apocalyptic number.

It is an amenable number.

1813404 is an abundant number, since it is smaller than the sum of its proper divisors (2439796).

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

1813404 is a wasteful number, since it uses less digits than its factorization.

1813404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1813404 is about 1346.6268971025. The cubic root of 1813404 is about 121.9452410350.

Adding to 1813404 its reverse (4043181), we get a palindrome (5856585).

The spelling of 1813404 in words is "one million, eight hundred thirteen thousand, four hundred four".