400043041220 has 48 divisors (see below), whose sum is σ = 872457757248. Its totient is φ = 153963089280.

The previous prime is 400043041187. The next prime is 400043041247. The reversal of 400043041220 is 22140340004.

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

It is a junction number, because it is equal to n+sod(n) for n = 400043041192 and 400043041201.

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 15 ways as a sum of consecutive naturals, for example, 3413771 + ... + 3529010.

It is an arithmetic number, because the mean of its divisors is an integer number (18176203276).

Almost surely, 2^400043041220 is an apocalyptic number.

It is an amenable number.

400043041220 is an abundant number, since it is smaller than the sum of its proper divisors (472414716028).

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

400043041220 is a wasteful number, since it uses less digits than its factorization.

400043041220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942900 (or 6942898 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 400043041220 its reverse (22140340004), we get a palindrome (422183381224).

The spelling of 400043041220 in words is "four hundred billion, forty-three million, forty-one thousand, two hundred twenty".