404165 has 4 divisors (see below), whose sum is σ = 485004. Its totient is φ = 323328.

The previous prime is 404161. The next prime is 404167. The reversal of 404165 is 561404.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174724 + 229441 = 418^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 404165 - 2² = 404161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40412 + ... + 40421.

It is an arithmetic number, because the mean of its divisors is an integer number (121251).

2⁴⁰⁴¹⁶⁵ is an apocalyptic number.

It is an amenable number.

404165 is a deficient number, since it is larger than the sum of its proper divisors (80839).

404165 is an equidigital number, since it uses as much as digits as its factorization.

404165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80838.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 404165 is about 635.7397266177. The cubic root of 404165 is about 73.9354806513.

Adding to 404165 its reverse (561404), we get a palindrome (965569).

The spelling of 404165 in words is "four hundred four thousand, one hundred sixty-five".