404040385640 has 32 divisors (see below), whose sum is σ = 909110380680. Its totient is φ = 161612685312.

The previous prime is 404040385613. The next prime is 404040385711. The reversal of 404040385640 is 46583040404.

It can be written as a sum of positive squares in 4 ways, for example, as 307743124516 + 96297261124 = 554746^2 + 310318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 404040385594 and 404040385603.

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 7 ways as a sum of consecutive naturals, for example, 2636564 + ... + 2785596.

Almost surely, 2^404040385640 is an apocalyptic number.

404040385640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404040385640 is an abundant number, since it is smaller than the sum of its proper divisors (505069995040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404040385640 is a wasteful number, since it uses less digits than its factorization.

404040385640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216821 (or 216817 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 38.

The spelling of 404040385640 in words is "four hundred four billion, forty million, three hundred eighty-five thousand, six hundred forty".