400040404405 has 4 divisors (see below), whose sum is σ = 480048485292. Its totient is φ = 320032323520.

The previous prime is 400040404399. The next prime is 400040404409. The reversal of 400040404405 is 504404040004.

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 69574085361 + 330466319044 = 263769^2 + 574862^2 .

It is a de Polignac number, because none of the positive numbers 2^k-400040404405 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 400040404405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040404409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40004040436 + ... + 40004040445.

It is an arithmetic number, because the mean of its divisors is an integer number (120012121323).

Almost surely, 2^400040404405 is an apocalyptic number.

It is an amenable number.

400040404405 is a deficient number, since it is larger than the sum of its proper divisors (80008080887).

400040404405 is an equidigital number, since it uses as much as digits as its factorization.

400040404405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80008080886.

The product of its (nonzero) digits is 5120, while the sum is 25.

Adding to 400040404405 its reverse (504404040004), we get a palindrome (904444444409).

The spelling of 400040404405 in words is "four hundred billion, forty million, four hundred four thousand, four hundred five".