400443424 has 12 divisors (see below), whose sum is σ = 788373054. Its totient is φ = 200221696.

The previous prime is 400443419. The next prime is 400443427. The reversal of 400443424 is 424344004.

It can be written as a sum of positive squares in only one way, i.e., 386515600 + 13927824 = 19660^2 + 3732^2 .

It is not an unprimeable number, because it can be changed into a prime (400443427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6256897 + ... + 6256960.

Almost surely, 2^400443424 is an apocalyptic number.

It is an amenable number.

400443424 is a deficient number, since it is larger than the sum of its proper divisors (387929630).

400443424 is a wasteful number, since it uses less digits than its factorization.

400443424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12513867 (or 12513859 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 25.

The square root of 400443424 is about 20011.0825294385. The cubic root of 400443424 is about 737.0784638466.

Adding to 400443424 its reverse (424344004), we get a palindrome (824787428).

The spelling of 400443424 in words is "four hundred million, four hundred forty-three thousand, four hundred twenty-four".