804040 has 16 divisors (see below), whose sum is σ = 1809180. Its totient is φ = 321600.

The previous prime is 804031. The next prime is 804043. The reversal of 804040 is 40408.

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 19044 = 886^2 + 138^2 .

It is a super-3 number, since 3×804040³ = 1559388113337792000, which contains 333 as substring.

804040 is a modest number, since divided by 4040 gives 80 as remainder.

It is not an unprimeable number, because it can be changed into a prime (804043) 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, 10011 + ... + 10090.

2⁸⁰⁴⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

804040 is an abundant number, since it is smaller than the sum of its proper divisors (1005140).

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

804040 is a wasteful number, since it uses less digits than its factorization.

804040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20112 (or 20108 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 804040 is about 896.6827755678. The cubic root of 804040 is about 92.9877811827.

Adding to 804040 its reverse (40408), we get a palindrome (844448).

The spelling of 804040 in words is "eight hundred four thousand, forty".