400000440040 has 32 divisors (see below), whose sum is σ = 939131470080. Its totient is φ = 153043646272.

The previous prime is 400000440029. The next prime is 400000440061. The reversal of 400000440040 is 40044000004.

It is a junction number, because it is equal to n+sod(n) for n = 400000439996 and 400000440023.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217390624 + ... + 217392463.

It is an arithmetic number, because the mean of its divisors is an integer number (29347858440).

Almost surely, 2^400000440040 is an apocalyptic number.

400000440040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400000440040 is an abundant number, since it is smaller than the sum of its proper divisors (539131030040).

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

400000440040 is a wasteful number, since it uses less digits than its factorization.

400000440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434783121 (or 434783117 counting only the distinct ones).

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

Adding to 400000440040 its reverse (40044000004), we get a palindrome (440044440044).

The spelling of 400000440040 in words is "four hundred billion, four hundred forty thousand, forty".