408404404085 has 4 divisors (see below), whose sum is σ = 490085284908. Its totient is φ = 326723523264.

The previous prime is 408404404049. The next prime is 408404404097. The reversal of 408404404085 is 580404404804.

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 236360296561 + 172044107524 = 486169^2 + 414782^2 .

It is a cyclic number.

It is not a de Polignac number, because 408404404085 - 2⁸ = 408404403829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40840440404 + ... + 40840440413.

It is an arithmetic number, because the mean of its divisors is an integer number (122521321227).

Almost surely, 2^408404404085 is an apocalyptic number.

It is an amenable number.

408404404085 is a deficient number, since it is larger than the sum of its proper divisors (81680880823).

408404404085 is an equidigital number, since it uses as much as digits as its factorization.

408404404085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81680880822.

The product of its (nonzero) digits is 327680, while the sum is 41.

Adding to 408404404085 its reverse (580404404804), we get a palindrome (988808808889).

The spelling of 408404404085 in words is "four hundred eight billion, four hundred four million, four hundred four thousand, eighty-five".