2543738440 has 32 divisors (see below), whose sum is σ = 5729276160. Its totient is φ = 1016452800.

The previous prime is 2543738437. The next prime is 2543738443. The reversal of 2543738440 is 448373452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2543738437) and next prime (2543738443).

It is a super-2 number, since 2×2543738440² = 12941210502267267200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2543738393 and 2543738402.

It is not an unprimeable number, because it can be changed into a prime (2543738443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7555 + ... + 71725.

It is an arithmetic number, because the mean of its divisors is an integer number (179039880).

Almost surely, 2^2543738440 is an apocalyptic number.

2543738440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2543738440 is an abundant number, since it is smaller than the sum of its proper divisors (3185537720).

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

2543738440 is a wasteful number, since it uses less digits than its factorization.

2543738440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65173 (or 65169 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The square root of 2543738440 is about 50435.4879028646. The cubic root of 2543738440 is about 1365.0780528478.

The spelling of 2543738440 in words is "two billion, five hundred forty-three million, seven hundred thirty-eight thousand, four hundred forty".