1388489717 has 2 divisors, whose sum is σ = 1388489718. Its totient is φ = 1388489716.

The previous prime is 1388489677. The next prime is 1388489743. The reversal of 1388489717 is 7179848831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 696220996 + 692268721 = 26386^2 + 26311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388489717 - 2¹⁰ = 1388488693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388489777) 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, 694244858 + 694244859.

It is an arithmetic number, because the mean of its divisors is an integer number (694244859).

Almost surely, 2^1388489717 is an apocalyptic number.

It is an amenable number.

1388489717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388489717 is an equidigital number, since it uses as much as digits as its factorization.

1388489717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 56.

The square root of 1388489717 is about 37262.4437872773. The cubic root of 1388489717 is about 1115.6146857026.

The spelling of 1388489717 in words is "one billion, three hundred eighty-eight million, four hundred eighty-nine thousand, seven hundred seventeen".