128015 has 4 divisors (see below), whose sum is σ = 153624. Its totient is φ = 102408.

The previous prime is 127997. The next prime is 128021. The reversal of 128015 is 510821.

128015 is nontrivially palindromic in base 13.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 510821 = 197 ⋅2593.

It is a cyclic number.

It is not a de Polignac number, because 128015 - 2⁶ = 127951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 127984 and 128002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12797 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (38406).

2¹²⁸⁰¹⁵ is an apocalyptic number.

128015 is a deficient number, since it is larger than the sum of its proper divisors (25609).

128015 is an equidigital number, since it uses as much as digits as its factorization.

128015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25608.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 128015 is about 357.7918389231. The cubic root of 128015 is about 50.3988105455.

Adding to 128015 its reverse (510821), we get a palindrome (638836).

The spelling of 128015 in words is "one hundred twenty-eight thousand, fifteen".