128299 has 4 divisors (see below), whose sum is σ = 135864. Its totient is φ = 120736.

The previous prime is 128291. The next prime is 128311. The reversal of 128299 is 992821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 992821 = 37 ⋅26833.

It is a cyclic number.

It is not a de Polignac number, because 128299 - 2³ = 128291 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 128299.

It is not an unprimeable number, because it can be changed into a prime (128291) 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 3 ways as a sum of consecutive naturals, for example, 3757 + ... + 3790.

It is an arithmetic number, because the mean of its divisors is an integer number (33966).

2¹²⁸²⁹⁹ is an apocalyptic number.

128299 is a deficient number, since it is larger than the sum of its proper divisors (7565).

128299 is an equidigital number, since it uses as much as digits as its factorization.

128299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7564.

The product of its digits is 2592, while the sum is 31.

The square root of 128299 is about 358.1884978611. The cubic root of 128299 is about 50.4360527714.

The spelling of 128299 in words is "one hundred twenty-eight thousand, two hundred ninety-nine".