128986387 has 2 divisors, whose sum is σ = 128986388. Its totient is φ = 128986386.

The previous prime is 128986373. The next prime is 128986409. The reversal of 128986387 is 783689821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128986387 - 2¹⁹ = 128462099 is a prime.

It is not a weakly prime, because it can be changed into another prime (128986337) 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, 64493193 + 64493194.

It is an arithmetic number, because the mean of its divisors is an integer number (64493194).

Almost surely, 2^128986387 is an apocalyptic number.

128986387 is a deficient number, since it is larger than the sum of its proper divisors (1).

128986387 is an equidigital number, since it uses as much as digits as its factorization.

128986387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The square root of 128986387 is about 11357.2173968803. The cubic root of 128986387 is about 505.2596606028.

The spelling of 128986387 in words is "one hundred twenty-eight million, nine hundred eighty-six thousand, three hundred eighty-seven".