128389855 has 8 divisors (see below), whose sum is σ = 168074064. Its totient is φ = 93374400.

The previous prime is 128389847. The next prime is 128389861. The reversal of 128389855 is 558983821.

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

It is not a de Polignac number, because 128389855 - 2³ = 128389847 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 128389799 and 128389808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167126 + ... + 1167235.

It is an arithmetic number, because the mean of its divisors is an integer number (21009258).

Almost surely, 2^128389855 is an apocalyptic number.

128389855 is a deficient number, since it is larger than the sum of its proper divisors (39684209).

128389855 is a wasteful number, since it uses less digits than its factorization.

128389855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334377.

The product of its digits is 691200, while the sum is 49.

The square root of 128389855 is about 11330.9247195452. The cubic root of 128389855 is about 504.4795540071.

It can be divided in two parts, 128 and 389855, that added together give a palindrome (389983).

The spelling of 128389855 in words is "one hundred twenty-eight million, three hundred eighty-nine thousand, eight hundred fifty-five".