1388131387 has 2 divisors, whose sum is σ = 1388131388. Its totient is φ = 1388131386.

The previous prime is 1388131363. The next prime is 1388131403. The reversal of 1388131387 is 7831318831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388131387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388131307) 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, 694065693 + 694065694.

It is an arithmetic number, because the mean of its divisors is an integer number (694065694).

Almost surely, 2^1388131387 is an apocalyptic number.

1388131387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388131387 is an equidigital number, since it uses as much as digits as its factorization.

1388131387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 1388131387 is about 37257.6352845964. The cubic root of 1388131387 is about 1115.5187078933.

The spelling of 1388131387 in words is "one billion, three hundred eighty-eight million, one hundred thirty-one thousand, three hundred eighty-seven".