1385642729 has 2 divisors, whose sum is σ = 1385642730. Its totient is φ = 1385642728.

The previous prime is 1385642719. The next prime is 1385642747. The reversal of 1385642729 is 9272465831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692900329 + 692742400 = 26323^2 + 26320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385642729 - 2⁸ = 1385642473 is a prime.

It is a super-3 number, since 3×1385642729³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1385642719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692821364 + 692821365.

It is an arithmetic number, because the mean of its divisors is an integer number (692821365).

Almost surely, 2^1385642729 is an apocalyptic number.

It is an amenable number.

1385642729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385642729 is an equidigital number, since it uses as much as digits as its factorization.

1385642729 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1385642729 is about 37224.2223424479. Note that the first 3 decimals coincide. The cubic root of 1385642729 is about 1114.8516708314.

The spelling of 1385642729 in words is "one billion, three hundred eighty-five million, six hundred forty-two thousand, seven hundred twenty-nine".