128966 has 4 divisors (see below), whose sum is σ = 193452. Its totient is φ = 64482.

The previous prime is 128959. The next prime is 128969. The reversal of 128966 is 669821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 669821 = 317 ⋅2113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128969) by changing a digit.

128966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32240 + ... + 32243.

It is an arithmetic number, because the mean of its divisors is an integer number (48363).

2¹²⁸⁹⁶⁶ is an apocalyptic number.

128966 is a deficient number, since it is larger than the sum of its proper divisors (64486).

128966 is an equidigital number, since it uses as much as digits as its factorization.

128966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64485.

The product of its digits is 5184, while the sum is 32.

The square root of 128966 is about 359.1183648882. The cubic root of 128966 is about 50.5233039521.

The spelling of 128966 in words is "one hundred twenty-eight thousand, nine hundred sixty-six".