1390648729 has 2 divisors, whose sum is σ = 1390648730. Its totient is φ = 1390648728.

The previous prime is 1390648711. The next prime is 1390648733. The reversal of 1390648729 is 9278460931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1378117129 + 12531600 = 37123^2 + 3540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390648729 - 2⁷ = 1390648601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1390648769) 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, 695324364 + 695324365.

It is an arithmetic number, because the mean of its divisors is an integer number (695324365).

Almost surely, 2^1390648729 is an apocalyptic number.

It is an amenable number.

1390648729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390648729 is an equidigital number, since it uses as much as digits as its factorization.

1390648729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 1390648729 is about 37291.4028832384. The cubic root of 1390648729 is about 1116.1926225603.

The spelling of 1390648729 in words is "one billion, three hundred ninety million, six hundred forty-eight thousand, seven hundred twenty-nine".