400043431100 has 36 divisors (see below), whose sum is σ = 879082797600. Its totient is φ = 157991832960.

The previous prime is 400043431043. The next prime is 400043431103. The reversal of 400043431100 is 1134340004.

It is a happy number.

It is a super-4 number, since 4×400043431100⁴ (a number of 48 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400043431103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25311305 + ... + 25327104.

It is an arithmetic number, because the mean of its divisors is an integer number (24418966600).

Almost surely, 2^400043431100 is an apocalyptic number.

It is an amenable number.

400043431100 is an abundant number, since it is smaller than the sum of its proper divisors (479039366500).

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

400043431100 is a wasteful number, since it uses less digits than its factorization.

400043431100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50638502 (or 50638495 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 400043431100 its reverse (1134340004), we get a palindrome (401177771104).

The spelling of 400043431100 in words is "four hundred billion, forty-three million, four hundred thirty-one thousand, one hundred".