819404 has 12 divisors (see below), whose sum is σ = 1446144. Its totient is φ = 406224.

The previous prime is 819391. The next prime is 819407. The reversal of 819404 is 404918.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (819407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299 + ... + 1314.

It is an arithmetic number, because the mean of its divisors is an integer number (120512).

2⁸¹⁹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

819404 is a deficient number, since it is larger than the sum of its proper divisors (626740).

819404 is a wasteful number, since it uses less digits than its factorization.

819404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744 (or 1742 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 819404 is about 905.2093680470. The cubic root of 819404 is about 93.5763339003.

The spelling of 819404 in words is "eight hundred nineteen thousand, four hundred four".