2543438440 has 64 divisors (see below), whose sum is σ = 6038841600. Its totient is φ = 962176512.

The previous prime is 2543438437. The next prime is 2543438453. The reversal of 2543438440 is 448343452.

2543438440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2543438440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66349 + ... + 97411.

It is an arithmetic number, because the mean of its divisors is an integer number (94356900).

Almost surely, 2^2543438440 is an apocalyptic number.

2543438440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2543438440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3019420800).

2543438440 is an abundant number, since it is smaller than the sum of its proper divisors (3495403160).

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

2543438440 is a wasteful number, since it uses less digits than its factorization.

2543438440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31186 (or 31182 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 37.

The square root of 2543438440 is about 50432.5137188302. The cubic root of 2543438440 is about 1365.0243864920.

The spelling of 2543438440 in words is "two billion, five hundred forty-three million, four hundred thirty-eight thousand, four hundred forty".