2439865217 has 2 divisors, whose sum is σ = 2439865218. Its totient is φ = 2439865216.

The previous prime is 2439865189. The next prime is 2439865243. The reversal of 2439865217 is 7125689342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1223320576 + 1216544641 = 34976^2 + 34879^2 .

It is a cyclic number.

It is not a de Polignac number, because 2439865217 - 2¹² = 2439861121 is a prime.

It is not a weakly prime, because it can be changed into another prime (2439865117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1219932608 + 1219932609.

It is an arithmetic number, because the mean of its divisors is an integer number (1219932609).

Almost surely, 2^2439865217 is an apocalyptic number.

It is an amenable number.

2439865217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2439865217 is an equidigital number, since it uses as much as digits as its factorization.

2439865217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 2439865217 is about 49394.9918210338. The cubic root of 2439865217 is about 1346.2383102836.

The spelling of 2439865217 in words is "two billion, four hundred thirty-nine million, eight hundred sixty-five thousand, two hundred seventeen".