2440638539 has 2 divisors, whose sum is σ = 2440638540. Its totient is φ = 2440638538.

The previous prime is 2440638527. The next prime is 2440638593. The reversal of 2440638539 is 9358360442.

Together with next prime (2440638593) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2440638539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2440638539.

It is not a weakly prime, because it can be changed into another prime (2440638509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1220319269 + 1220319270.

It is an arithmetic number, because the mean of its divisors is an integer number (1220319270).

Almost surely, 2^2440638539 is an apocalyptic number.

2440638539 is a deficient number, since it is larger than the sum of its proper divisors (1).

2440638539 is an equidigital number, since it uses as much as digits as its factorization.

2440638539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 44.

The square root of 2440638539 is about 49402.8191402070. The cubic root of 2440638539 is about 1346.3805265727.

The spelling of 2440638539 in words is "two billion, four hundred forty million, six hundred thirty-eight thousand, five hundred thirty-nine".