400004053520 has 20 divisors (see below), whose sum is σ = 930009424620. Its totient is φ = 160001621376.

The previous prime is 400004053511. The next prime is 400004053523. The reversal of 400004053520 is 25350400004.

It can be written as a sum of positive squares in 2 ways, for example, as 84627464464 + 315376589056 = 290908^2 + 561584^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (400004053523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500025255 + ... + 2500025414.

It is an arithmetic number, because the mean of its divisors is an integer number (46500471231).

Almost surely, 2^400004053520 is an apocalyptic number.

400004053520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400004053520 is an abundant number, since it is smaller than the sum of its proper divisors (530005371100).

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

400004053520 is a wasteful number, since it uses less digits than its factorization.

400004053520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000050682 (or 5000050676 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

Adding to 400004053520 its reverse (25350400004), we get a palindrome (425354453524).

The spelling of 400004053520 in words is "four hundred billion, four million, fifty-three thousand, five hundred twenty".