128243859 has 8 divisors (see below), whose sum is σ = 175162512. Its totient is φ = 83410560.

The previous prime is 128243849. The next prime is 128243861. The reversal of 128243859 is 958342821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128243859 - 2⁵ = 128243827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128243859.

It is not an unprimeable number, because it can be changed into a prime (128243849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521194 + ... + 521439.

It is an arithmetic number, because the mean of its divisors is an integer number (21895314).

Almost surely, 2^128243859 is an apocalyptic number.

128243859 is a deficient number, since it is larger than the sum of its proper divisors (46918653).

128243859 is a wasteful number, since it uses less digits than its factorization.

128243859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042677.

The product of its digits is 138240, while the sum is 42.

The square root of 128243859 is about 11324.4805178869. The cubic root of 128243859 is about 504.2882618111.

The spelling of 128243859 in words is "one hundred twenty-eight million, two hundred forty-three thousand, eight hundred fifty-nine".