404000400040 has 32 divisors (see below), whose sum is σ = 910615517280. Its totient is φ = 161313116992.

The previous prime is 404000399911. The next prime is 404000400053. The reversal of 404000400040 is 40004000404.

404000400040 is a modest number, since divided by 400040 gives 4040 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 404000399987 and 404000400023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8947294 + ... + 8992333.

It is an arithmetic number, because the mean of its divisors is an integer number (28456734915).

Almost surely, 2^404000400040 is an apocalyptic number.

404000400040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404000400040 is an abundant number, since it is smaller than the sum of its proper divisors (506615117240).

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

404000400040 is a wasteful number, since it uses less digits than its factorization.

404000400040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17940201 (or 17940197 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 404000400040 its reverse (40004000404), we get a palindrome (444004400444).

The spelling of 404000400040 in words is "four hundred four billion, four hundred thousand, forty".