128257387 has 2 divisors, whose sum is σ = 128257388. Its totient is φ = 128257386.

The previous prime is 128257379. The next prime is 128257399. The reversal of 128257387 is 783752821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128257387 - 2³ = 128257379 is a prime.

It is not a weakly prime, because it can be changed into another prime (128257187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64128693 + 64128694.

It is an arithmetic number, because the mean of its divisors is an integer number (64128694).

Almost surely, 2^128257387 is an apocalyptic number.

128257387 is a deficient number, since it is larger than the sum of its proper divisors (1).

128257387 is an equidigital number, since it uses as much as digits as its factorization.

128257387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 128257387 is about 11325.0777922273. The cubic root of 128257387 is about 504.3059930610.

The spelling of 128257387 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, three hundred eighty-seven".