804400 has 30 divisors (see below), whose sum is σ = 1933532. Its totient is φ = 321600.

The previous prime is 804383. The next prime is 804409. The reversal of 804400 is 4408.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (804409) 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 5 ways as a sum of consecutive naturals, for example, 606 + ... + 1405.

2⁸⁰⁴⁴⁰⁰ is an apocalyptic number.

804400 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

804400 is an abundant number, since it is smaller than the sum of its proper divisors (1129132).

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

804400 is a wasteful number, since it uses less digits than its factorization.

804400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029 (or 2018 counting only the distinct ones).

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

The square root of 804400 is about 896.8834929911. The cubic root of 804400 is about 93.0016571948.

Adding to 804400 its reverse (4408), we get a palindrome (808808).

The spelling of 804400 in words is "eight hundred four thousand, four hundred".