404080809 has 64 divisors (see below), whose sum is σ = 651110400. Its totient is φ = 220147200.

The previous prime is 404080801. The next prime is 404080823. The reversal of 404080809 is 908080404.

It is not a de Polignac number, because 404080809 - 2³ = 404080801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 404080809.

It is not an unprimeable number, because it can be changed into a prime (404080801) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1290837 + ... + 1291149.

It is an arithmetic number, because the mean of its divisors is an integer number (10173600).

Almost surely, 2^404080809 is an apocalyptic number.

It is an amenable number.

404080809 is a deficient number, since it is larger than the sum of its proper divisors (247029591).

404080809 is a wasteful number, since it uses less digits than its factorization.

404080809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 404080809 is about 20101.7613407383. The cubic root of 404080809 is about 739.3034649869.

The spelling of 404080809 in words is "four hundred four million, eighty thousand, eight hundred nine".