1386938309 has 2 divisors, whose sum is σ = 1386938310. Its totient is φ = 1386938308.

The previous prime is 1386938281. The next prime is 1386938317. The reversal of 1386938309 is 9038396831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1319287684 + 67650625 = 36322^2 + 8225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1386938309 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 (1386938809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693469154 + 693469155.

It is an arithmetic number, because the mean of its divisors is an integer number (693469155).

Almost surely, 2^1386938309 is an apocalyptic number.

It is an amenable number.

1386938309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386938309 is an equidigital number, since it uses as much as digits as its factorization.

1386938309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 1386938309 is about 37241.6206548534. The cubic root of 1386938309 is about 1115.1990257844.

The spelling of 1386938309 in words is "one billion, three hundred eighty-six million, nine hundred thirty-eight thousand, three hundred nine".