804405 has 32 divisors (see below), whose sum is σ = 1511424. Its totient is φ = 357696.

The previous prime is 804383. The next prime is 804409. The reversal of 804405 is 504408.

804405 = T₆ + T₇ + ... + T₁₆₈.

It is not a de Polignac number, because 804405 - 2⁶ = 804341 is a prime.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 804405.

It is not an unprimeable number, because it can be changed into a prime (804409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4854 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (47232).

2⁸⁰⁴⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

804405 is a deficient number, since it is larger than the sum of its proper divisors (707019).

804405 is a wasteful number, since it uses less digits than its factorization.

804405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 804405 is about 896.8862804169. The cubic root of 804405 is about 93.0018498880.

The spelling of 804405 in words is "eight hundred four thousand, four hundred five".