128843387 has 2 divisors, whose sum is σ = 128843388. Its totient is φ = 128843386.

The previous prime is 128843383. The next prime is 128843399. The reversal of 128843387 is 783348821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (783348821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128843387 - 2² = 128843383 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128843383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64421693 + 64421694.

It is an arithmetic number, because the mean of its divisors is an integer number (64421694).

Almost surely, 2^128843387 is an apocalyptic number.

128843387 is a deficient number, since it is larger than the sum of its proper divisors (1).

128843387 is an equidigital number, since it uses as much as digits as its factorization.

128843387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 44.

The square root of 128843387 is about 11350.9200948646. The cubic root of 128843387 is about 505.0728738412.

The spelling of 128843387 in words is "one hundred twenty-eight million, eight hundred forty-three thousand, three hundred eighty-seven".