400520254144 has 56 divisors (see below), whose sum is σ = 837177182640. Its totient is φ = 189592187904.

The previous prime is 400520254129. The next prime is 400520254177. The reversal of 400520254144 is 441452025004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1705182 + ... + 1925794.

Almost surely, 2^400520254144 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 400520254144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418588591320).

400520254144 is an abundant number, since it is smaller than the sum of its proper divisors (436656928496).

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

400520254144 is a wasteful number, since it uses less digits than its factorization.

400520254144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222137 (or 222127 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 400520254144 its reverse (441452025004), we get a palindrome (841972279148).

The spelling of 400520254144 in words is "four hundred billion, five hundred twenty million, two hundred fifty-four thousand, one hundred forty-four".