400131120324 has 96 divisors (see below), whose sum is σ = 1029610391040. Its totient is φ = 120173879808.

The previous prime is 400131120307. The next prime is 400131120349. The reversal of 400131120324 is 423021131004.

It is a self number, because there is not a number n which added to its sum of digits gives 400131120324.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2661682 + ... + 2807990.

It is an arithmetic number, because the mean of its divisors is an integer number (10725108240).

Almost surely, 2^400131120324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400131120324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (514805195520).

400131120324 is an abundant number, since it is smaller than the sum of its proper divisors (629479270716).

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

400131120324 is a wasteful number, since it uses less digits than its factorization.

400131120324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146749 (or 146747 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 400131120324 its reverse (423021131004), we get a palindrome (823152251328).

The spelling of 400131120324 in words is "four hundred billion, one hundred thirty-one million, one hundred twenty thousand, three hundred twenty-four".