128489019 has 4 divisors (see below), whose sum is σ = 171318696. Its totient is φ = 85659344.

The previous prime is 128488999. The next prime is 128489021. The reversal of 128489019 is 910984821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128489019 - 2⁷ = 128488891 is a prime.

It is a super-2 number, since 2×128489019² = 33018856007164722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128489059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21414834 + ... + 21414839.

It is an arithmetic number, because the mean of its divisors is an integer number (42829674).

Almost surely, 2^128489019 is an apocalyptic number.

128489019 is a deficient number, since it is larger than the sum of its proper divisors (42829677).

128489019 is an equidigital number, since it uses as much as digits as its factorization.

128489019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42829676.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 128489019 is about 11335.2996872601. The cubic root of 128489019 is about 504.6094015886.

The spelling of 128489019 in words is "one hundred twenty-eight million, four hundred eighty-nine thousand, nineteen".