400440844 has 24 divisors (see below), whose sum is σ = 713423088. Its totient is φ = 196616640.

The previous prime is 400440823. The next prime is 400440863. The reversal of 400440844 is 448044004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230202 + ... + 231934.

It is an arithmetic number, because the mean of its divisors is an integer number (29725962).

Almost surely, 2^400440844 is an apocalyptic number.

It is an amenable number.

400440844 is a deficient number, since it is larger than the sum of its proper divisors (312982244).

400440844 is a wasteful number, since it uses less digits than its factorization.

400440844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2745 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

The square root of 400440844 is about 20011.0180650561. The cubic root of 400440844 is about 737.0768808793.

Adding to 400440844 its reverse (448044004), we get a palindrome (848484848).

The spelling of 400440844 in words is "four hundred million, four hundred forty thousand, eight hundred forty-four".