1339865909 has 2 divisors, whose sum is σ = 1339865910. Its totient is φ = 1339865908.

The previous prime is 1339865887. The next prime is 1339865951. The reversal of 1339865909 is 9095689331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1287230884 + 52635025 = 35878^2 + 7255^2 .

It is an emirp because it is prime and its reverse (9095689331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1339865909 - 2¹⁶ = 1339800373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1339865809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669932954 + 669932955.

It is an arithmetic number, because the mean of its divisors is an integer number (669932955).

Almost surely, 2^1339865909 is an apocalyptic number.

It is an amenable number.

1339865909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1339865909 is an equidigital number, since it uses as much as digits as its factorization.

1339865909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 1339865909 is about 36604.1788461372. The cubic root of 1339865909 is about 1102.4369961408.

The spelling of 1339865909 in words is "one billion, three hundred thirty-nine million, eight hundred sixty-five thousand, nine hundred nine".