400043321100 has 72 divisors (see below), whose sum is σ = 1286065203920. Its totient is φ = 106678218240.

The previous prime is 400043321099. The next prime is 400043321143. The reversal of 400043321100 is 1123340004.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 74079397 + ... + 74084796.

Almost surely, 2^400043321100 is an apocalyptic number.

It is an amenable number.

400043321100 is an abundant number, since it is smaller than the sum of its proper divisors (886021882820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400043321100 is a wasteful number, since it uses less digits than its factorization.

400043321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148164216 (or 148164203 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 400043321100 its reverse (1123340004), we get a palindrome (401166661104).

The spelling of 400043321100 in words is "four hundred billion, forty-three million, three hundred twenty-one thousand, one hundred".