400404442 has 32 divisors (see below), whose sum is σ = 651006720. Its totient is φ = 184078080.

The previous prime is 400404391. The next prime is 400404449. The reversal of 400404442 is 244404004.

It is not an unprimeable number, because it can be changed into a prime (400404449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362463 + ... + 363565.

It is an arithmetic number, because the mean of its divisors is an integer number (20343960).

Almost surely, 2^400404442 is an apocalyptic number.

400404442 is a deficient number, since it is larger than the sum of its proper divisors (250602278).

400404442 is a wasteful number, since it uses less digits than its factorization.

400404442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398.

The product of its (nonzero) digits is 2048, while the sum is 22.

The square root of 400404442 is about 20010.1084954580. The cubic root of 400404442 is about 737.0545455906.

Adding to 400404442 its reverse (244404004), we get a palindrome (644808446).

The spelling of 400404442 in words is "four hundred million, four hundred four thousand, four hundred forty-two".