806404 has 9 divisors (see below), whose sum is σ = 1414357. Its totient is φ = 402304.

The previous prime is 806389. The next prime is 806447. The reversal of 806404 is 404608.

The square root of 806404 is 898.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 492804 + 313600 = 702^2 + 560^2 .

It is a super-2 number, since 2×806404² = 1300574822432, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

806404 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 2 ways as a sum of consecutive naturals, for example, 1572 + ... + 2020.

2⁸⁰⁶⁴⁰⁴ is an apocalyptic number.

806404 is the 898-th square number.

It is an amenable number.

806404 is a deficient number, since it is larger than the sum of its proper divisors (607953).

806404 is an equidigital number, since it uses as much as digits as its factorization.

806404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The cubic root of 806404 is about 93.0788247577.

The spelling of 806404 in words is "eight hundred six thousand, four hundred four".