2644139039 has 2 divisors, whose sum is σ = 2644139040. Its totient is φ = 2644139038.

The previous prime is 2644139033. The next prime is 2644139107. The reversal of 2644139039 is 9309314462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2644139039 - 2¹⁶ = 2644073503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2644138987 and 2644139005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2644139033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322069519 + 1322069520.

It is an arithmetic number, because the mean of its divisors is an integer number (1322069520).

Almost surely, 2^2644139039 is an apocalyptic number.

2644139039 is a deficient number, since it is larger than the sum of its proper divisors (1).

2644139039 is an equidigital number, since it uses as much as digits as its factorization.

2644139039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 2644139039 is about 51421.1925085368. The cubic root of 2644139039 is about 1382.8065544977.

The spelling of 2644139039 in words is "two billion, six hundred forty-four million, one hundred thirty-nine thousand, thirty-nine".