1387526389 has 2 divisors, whose sum is σ = 1387526390. Its totient is φ = 1387526388.

The previous prime is 1387526341. The next prime is 1387526401. The reversal of 1387526389 is 9836257831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855855025 + 531671364 = 29255^2 + 23058^2 .

It is an emirp because it is prime and its reverse (9836257831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387526389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387521389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693763194 + 693763195.

It is an arithmetic number, because the mean of its divisors is an integer number (693763195).

Almost surely, 2^1387526389 is an apocalyptic number.

It is an amenable number.

1387526389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387526389 is an equidigital number, since it uses as much as digits as its factorization.

1387526389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The square root of 1387526389 is about 37249.5152854369. The cubic root of 1387526389 is about 1115.3566231742.

The spelling of 1387526389 in words is "one billion, three hundred eighty-seven million, five hundred twenty-six thousand, three hundred eighty-nine".