400000404400 has 30 divisors (see below), whose sum is σ = 961000972532. Its totient is φ = 160000161600.

The previous prime is 400000404383. The next prime is 400000404403. The reversal of 400000404400 is 4404000004.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (400000404403) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 500000106 + ... + 500000905.

Almost surely, 2^400000404400 is an apocalyptic number.

400000404400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400000404400 is an abundant number, since it is smaller than the sum of its proper divisors (561000568132).

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

400000404400 is a wasteful number, since it uses less digits than its factorization.

400000404400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000001029 (or 1000001018 counting only the distinct ones).

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

Adding to 400000404400 its reverse (4404000004), we get a palindrome (404404404404).

The spelling of 400000404400 in words is "four hundred billion, four hundred four thousand, four hundred".