1388881673 has 2 divisors, whose sum is σ = 1388881674. Its totient is φ = 1388881672.

The previous prime is 1388881667. The next prime is 1388881723. The reversal of 1388881673 is 3761888831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142642809 + 246238864 = 33803^2 + 15692^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388881673 - 2³⁰ = 315139849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388881573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694440836 + 694440837.

It is an arithmetic number, because the mean of its divisors is an integer number (694440837).

Almost surely, 2^1388881673 is an apocalyptic number.

It is an amenable number.

1388881673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388881673 is an equidigital number, since it uses as much as digits as its factorization.

1388881673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 53.

The square root of 1388881673 is about 37267.7028135623. The cubic root of 1388881673 is about 1115.7196512454.

The spelling of 1388881673 in words is "one billion, three hundred eighty-eight million, eight hundred eighty-one thousand, six hundred seventy-three".