404395684389 has 24 divisors (see below), whose sum is σ = 594513508472. Its totient is φ = 264815464320.

The previous prime is 404395684313. The next prime is 404395684477. The reversal of 404395684389 is 983486593404.

404395684389 is a `hidden beast` number, since 4 + 0 + 4 + 39 + 568 + 4 + 38 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 187179100164 + 217216584225 = 432642^2 + 466065^2 .

It is not a de Polignac number, because 404395684389 - 2⁹ = 404395683877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404395684289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100042 + ... + 904875.

Almost surely, 2^404395684389 is an apocalyptic number.

It is an amenable number.

404395684389 is a deficient number, since it is larger than the sum of its proper divisors (190117824083).

404395684389 is a wasteful number, since it uses less digits than its factorization.

404395684389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005717 (or 1005714 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 63.

The spelling of 404395684389 in words is "four hundred four billion, three hundred ninety-five million, six hundred eighty-four thousand, three hundred eighty-nine".