2540540243 has 8 divisors (see below), whose sum is σ = 2548435968. Its totient is φ = 2532655944.

The previous prime is 2540540221. The next prime is 2540540257. The reversal of 2540540243 is 3420450452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2540540243 - 2¹² = 2540536147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540540263) 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, 662630 + ... + 666452.

It is an arithmetic number, because the mean of its divisors is an integer number (318554496).

Almost surely, 2^2540540243 is an apocalyptic number.

2540540243 is a deficient number, since it is larger than the sum of its proper divisors (7895725).

2540540243 is a wasteful number, since it uses less digits than its factorization.

2540540243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713.

The product of its (nonzero) digits is 19200, while the sum is 29.

The square root of 2540540243 is about 50403.7721108252. The cubic root of 2540540243 is about 1364.5057168167.

Adding to 2540540243 its reverse (3420450452), we get a palindrome (5960990695).

The spelling of 2540540243 in words is "two billion, five hundred forty million, five hundred forty thousand, two hundred forty-three".