128995 has 4 divisors (see below), whose sum is σ = 154800. Its totient is φ = 103192.

The previous prime is 128993. The next prime is 129001. The reversal of 128995 is 599821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 599821 = 127 ⋅4723.

It is a cyclic number.

It is not a de Polignac number, because 128995 - 2¹ = 128993 is a prime.

128995 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 128995.

It is not an unprimeable number, because it can be changed into a prime (128993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12895 + ... + 12904.

It is an arithmetic number, because the mean of its divisors is an integer number (38700).

2¹²⁸⁹⁹⁵ is an apocalyptic number.

128995 is a deficient number, since it is larger than the sum of its proper divisors (25805).

128995 is an equidigital number, since it uses as much as digits as its factorization.

128995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25804.

The product of its digits is 6480, while the sum is 34.

The square root of 128995 is about 359.1587392783. The cubic root of 128995 is about 50.5270906504.

The spelling of 128995 in words is "one hundred twenty-eight thousand, nine hundred ninety-five".