128115 has 32 divisors (see below), whose sum is σ = 248640. Its totient is φ = 62208.

The previous prime is 128113. The next prime is 128119. The reversal of 128115 is 511821.

It is not a de Polignac number, because 128115 - 2¹ = 128113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128111) 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 31 ways as a sum of consecutive naturals, for example, 1719 + ... + 1791.

It is an arithmetic number, because the mean of its divisors is an integer number (7770).

2¹²⁸¹¹⁵ is an apocalyptic number.

128115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128115 is a deficient number, since it is larger than the sum of its proper divisors (120525).

128115 is a wasteful number, since it uses less digits than its factorization.

128115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 94 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 128115 is about 357.9315577034. The cubic root of 128115 is about 50.4119302823.

Adding to 128115 its reverse (511821), we get a palindrome (639936).

It can be divided in two parts, 1281 and 15, that added together give a 4-th power (1296 = 6⁴).

The spelling of 128115 in words is "one hundred twenty-eight thousand, one hundred fifteen".