2440001243 has 4 divisors (see below), whose sum is σ = 2476419240. Its totient is φ = 2403583248.

The previous prime is 2440001237. The next prime is 2440001273. The reversal of 2440001243 is 3421000442.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2440001243 - 2²⁰ = 2438952667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2440001233) 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, 18208898 + ... + 18209031.

It is an arithmetic number, because the mean of its divisors is an integer number (619104810).

Almost surely, 2^2440001243 is an apocalyptic number.

2440001243 is a deficient number, since it is larger than the sum of its proper divisors (36417997).

2440001243 is an equidigital number, since it uses as much as digits as its factorization.

2440001243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36417996.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2440001243 is about 49396.3687228120. The cubic root of 2440001243 is about 1346.2633280603.

Adding to 2440001243 its reverse (3421000442), we get a palindrome (5861001685).

The spelling of 2440001243 in words is "two billion, four hundred forty million, one thousand, two hundred forty-three".