404040405 has 16 divisors (see below), whose sum is σ = 653131584. Its totient is φ = 213265920.

The previous prime is 404040401. The next prime is 404040409. The reversal of 404040405 is 504040404.

It is an interprime number because it is at equal distance from previous prime (404040401) and next prime (404040409).

It is not a de Polignac number, because 404040405 - 2² = 404040401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404040401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137391 + ... + 140300.

It is an arithmetic number, because the mean of its divisors is an integer number (40820724).

Almost surely, 2^404040405 is an apocalyptic number.

It is an amenable number.

404040405 is a deficient number, since it is larger than the sum of its proper divisors (249091179).

404040405 is a wasteful number, since it uses less digits than its factorization.

404040405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277796.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 404040405 is about 20100.7563290539. The cubic root of 404040405 is about 739.2788232055.

Adding to 404040405 its reverse (504040404), we get a palindrome (908080809).

Subtracting 404040405 from its reverse (504040404), we obtain a palindrome (99999999).

The spelling of 404040405 in words is "four hundred four million, forty thousand, four hundred five".