400312112020 has 12 divisors (see below), whose sum is σ = 840655435284. Its totient is φ = 160124844800.

The previous prime is 400312111967. The next prime is 400312112021. The reversal of 400312112020 is 20211213004.

It can be written as a sum of positive squares in 2 ways, for example, as 226513172356 + 173798939664 = 475934^2 + 416892^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400312111985 and 400312112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400312112021) 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 3 ways as a sum of consecutive naturals, for example, 10007802781 + ... + 10007802820.

It is an arithmetic number, because the mean of its divisors is an integer number (70054619607).

Almost surely, 2^400312112020 is an apocalyptic number.

It is an amenable number.

400312112020 is an abundant number, since it is smaller than the sum of its proper divisors (440343323264).

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

400312112020 is a wasteful number, since it uses less digits than its factorization.

400312112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20015605610 (or 20015605608 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 400312112020 its reverse (20211213004), we get a palindrome (420523325024).

The spelling of 400312112020 in words is "four hundred billion, three hundred twelve million, one hundred twelve thousand, twenty".