404000040040 has 16 divisors (see below), whose sum is σ = 909000090180. Its totient is φ = 161600016000.

The previous prime is 404000039999. The next prime is 404000040061. The reversal of 404000040040 is 40040000404.

It can be written as a sum of positive squares in 2 ways, for example, as 366201681316 + 37798358724 = 605146^2 + 194418^2 .

It is a junction number, because it is equal to n+sod(n) for n = 404000039996 and 404000040023.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5050000461 + ... + 5050000540.

Almost surely, 2^404000040040 is an apocalyptic number.

404000040040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404000040040 is an abundant number, since it is smaller than the sum of its proper divisors (505000050140).

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

404000040040 is a wasteful number, since it uses less digits than its factorization.

404000040040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100001012 (or 10100001008 counting only the distinct ones).

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

Adding to 404000040040 its reverse (40040000404), we get a palindrome (444040040444).

The spelling of 404000040040 in words is "four hundred four billion, forty thousand, forty".