1387265729 has 2 divisors, whose sum is σ = 1387265730. Its totient is φ = 1387265728.

The previous prime is 1387265707. The next prime is 1387265743. The reversal of 1387265729 is 9275627831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263944704 + 123321025 = 35552^2 + 11105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387265729 - 2¹² = 1387261633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1387265629) 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, 693632864 + 693632865.

It is an arithmetic number, because the mean of its divisors is an integer number (693632865).

Almost surely, 2^1387265729 is an apocalyptic number.

It is an amenable number.

1387265729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387265729 is an equidigital number, since it uses as much as digits as its factorization.

1387265729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 50.

The square root of 1387265729 is about 37246.0162836242. The cubic root of 1387265729 is about 1115.2867753580.

The spelling of 1387265729 in words is "one billion, three hundred eighty-seven million, two hundred sixty-five thousand, seven hundred twenty-nine".