128489443 has 2 divisors, whose sum is σ = 128489444. Its totient is φ = 128489442.

The previous prime is 128489441. The next prime is 128489453. The reversal of 128489443 is 344984821.

It is a weak prime.

It is an emirp because it is prime and its reverse (344984821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128489443 - 2¹ = 128489441 is a prime.

Together with 128489441, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 128489443.

It is not a weakly prime, because it can be changed into another prime (128489441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64244721 + 64244722.

It is an arithmetic number, because the mean of its divisors is an integer number (64244722).

Almost surely, 2^128489443 is an apocalyptic number.

128489443 is a deficient number, since it is larger than the sum of its proper divisors (1).

128489443 is an equidigital number, since it uses as much as digits as its factorization.

128489443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 43.

The square root of 128489443 is about 11335.3183898821. The cubic root of 128489443 is about 504.6099566403.

The spelling of 128489443 in words is "one hundred twenty-eight million, four hundred eighty-nine thousand, four hundred forty-three".