400440444844 has 18 divisors (see below), whose sum is σ = 770268707852. Its totient is φ = 182018383800.

The previous prime is 400440444839. The next prime is 400440444869. The reversal of 400440444844 is 448444044004.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 400440444797 and 400440444806.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 413677662 + ... + 413678629.

Almost surely, 2^400440444844 is an apocalyptic number.

400440444844 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

400440444844 is a deficient number, since it is larger than the sum of its proper divisors (369828263008).

400440444844 is a wasteful number, since it uses less digits than its factorization.

400440444844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827356317 (or 827356304 counting only the distinct ones).

The product of its (nonzero) digits is 524288, while the sum is 40.

Adding to 400440444844 its reverse (448444044004), we get a palindrome (848884488848).

The spelling of 400440444844 in words is "four hundred billion, four hundred forty million, four hundred forty-four thousand, eight hundred forty-four".