404040065 has 32 divisors (see below), whose sum is σ = 571923072. Its totient is φ = 270144000.

The previous prime is 404040047. The next prime is 404040067. The reversal of 404040065 is 560040404.

It is a happy number.

It is not a de Polignac number, because 404040065 - 2¹⁸ = 403777921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404040065.

It is not an unprimeable number, because it can be changed into a prime (404040067) 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, 199910 + ... + 201920.

It is an arithmetic number, because the mean of its divisors is an integer number (17872596).

Almost surely, 2^404040065 is an apocalyptic number.

It is an amenable number.

404040065 is a deficient number, since it is larger than the sum of its proper divisors (167883007).

404040065 is a wasteful number, since it uses less digits than its factorization.

404040065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 404040065 is about 20100.7478716589. The cubic root of 404040065 is about 739.2786158378.

Adding to 404040065 its reverse (560040404), we get a palindrome (964080469).

The spelling of 404040065 in words is "four hundred four million, forty thousand, sixty-five".