128243 has 4 divisors (see below), whose sum is σ = 129000. Its totient is φ = 127488.

The previous prime is 128239. The next prime is 128257. The reversal of 128243 is 342821.

128243 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 128243 - 2² = 128239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8 + ... + 506.

It is an arithmetic number, because the mean of its divisors is an integer number (32250).

2¹²⁸²⁴³ is an apocalyptic number.

128243 is a deficient number, since it is larger than the sum of its proper divisors (757).

128243 is an equidigital number, since it uses as much as digits as its factorization.

128243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756.

The product of its digits is 384, while the sum is 20.

The square root of 128243 is about 358.1103181982. The cubic root of 128243 is about 50.4287135871.

The spelling of 128243 in words is "one hundred twenty-eight thousand, two hundred forty-three".