404165409 has 4 divisors (see below), whose sum is σ = 538887216. Its totient is φ = 269443604.

The previous prime is 404165401. The next prime is 404165459. The reversal of 404165409 is 904561404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 404165409 - 2³ = 404165401 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 404165409.

It is not an unprimeable number, because it can be changed into a prime (404165401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67360899 + ... + 67360904.

It is an arithmetic number, because the mean of its divisors is an integer number (134721804).

Almost surely, 2^404165409 is an apocalyptic number.

It is an amenable number.

404165409 is a deficient number, since it is larger than the sum of its proper divisors (134721807).

404165409 is a wasteful number, since it uses less digits than its factorization.

404165409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134721806.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 404165409 is about 20103.8655238240. The cubic root of 404165409 is about 739.3550559124.

The spelling of 404165409 in words is "four hundred four million, one hundred sixty-five thousand, four hundred nine".