400400044 has 24 divisors (see below), whose sum is σ = 767264400. Its totient is φ = 181318080.

The previous prime is 400400041. The next prime is 400400081. The reversal of 400400044 is 440004004.

It is not an unprimeable number, because it can be changed into a prime (400400041) 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 7 ways as a sum of consecutive naturals, for example, 5079 + ... + 28750.

It is an arithmetic number, because the mean of its divisors is an integer number (31969350).

Almost surely, 2^400400044 is an apocalyptic number.

400400044 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

400400044 is a deficient number, since it is larger than the sum of its proper divisors (366864356).

400400044 is a wasteful number, since it uses less digits than its factorization.

400400044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34113 (or 34111 counting only the distinct ones).

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

The square root of 400400044 is about 20009.9986006996. The cubic root of 400400044 is about 737.0518470043.

Adding to 400400044 its reverse (440004004), we get a palindrome (840404048).

The spelling of 400400044 in words is "four hundred million, four hundred thousand, forty-four".