40404040405 has 16 divisors (see below), whose sum is σ = 49591957104. Its totient is φ = 31589908480.

The previous prime is 40404040399. The next prime is 40404040451. The reversal of 40404040405 is 50404040404.

It can be written as a sum of positive squares in 8 ways, for example, as 18441096804 + 21962943601 = 135798^2 + 148199^2 .

It is not a de Polignac number, because 40404040405 - 2¹³ = 40404032213 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 40404040405.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 228526 + ... + 364735.

It is an arithmetic number, because the mean of its divisors is an integer number (3099497319).

Almost surely, 2^40404040405 is an apocalyptic number.

It is an amenable number.

40404040405 is a deficient number, since it is larger than the sum of its proper divisors (9187916699).

40404040405 is a wasteful number, since it uses less digits than its factorization.

40404040405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593576.

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

Adding to 40404040405 its reverse (50404040404), we get a palindrome (90808080809).

Subtracting 40404040405 from its reverse (50404040404), we obtain a palindrome (9999999999).

The spelling of 40404040405 in words is "forty billion, four hundred four million, forty thousand, four hundred five".