128189959 has 4 divisors (see below), whose sum is σ = 129388104. Its totient is φ = 126991816.

The previous prime is 128189953. The next prime is 128189969. The reversal of 128189959 is 959981821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959981821 = 19 ⋅50525359.

It is a cyclic number.

It is not a de Polignac number, because 128189959 - 2³ = 128189951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128189951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 598912 + ... + 599125.

It is an arithmetic number, because the mean of its divisors is an integer number (32347026).

Almost surely, 2^128189959 is an apocalyptic number.

128189959 is a deficient number, since it is larger than the sum of its proper divisors (1198145).

128189959 is a wasteful number, since it uses less digits than its factorization.

128189959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198144.

The product of its digits is 466560, while the sum is 52.

The square root of 128189959 is about 11322.1004676694. The cubic root of 128189959 is about 504.2176022972.

The spelling of 128189959 in words is "one hundred twenty-eight million, one hundred eighty-nine thousand, nine hundred fifty-nine".