128823 has 8 divisors (see below), whose sum is σ = 179328. Its totient is φ = 82104.

The previous prime is 128819. The next prime is 128831. The reversal of 128823 is 328821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128823 - 2² = 128819 is a prime.

It is a super-3 number, since 3×128823³ = 6413594243333301, which contains 333 as substring.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 128793 and 128802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128813) 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 7 ways as a sum of consecutive naturals, for example, 865 + ... + 1002.

It is an arithmetic number, because the mean of its divisors is an integer number (22416).

2¹²⁸⁸²³ is an apocalyptic number.

128823 is a deficient number, since it is larger than the sum of its proper divisors (50505).

128823 is a wasteful number, since it uses less digits than its factorization.

128823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893.

The product of its digits is 768, while the sum is 24.

The square root of 128823 is about 358.9192109654. The cubic root of 128823 is about 50.5046233064.

The spelling of 128823 in words is "one hundred twenty-eight thousand, eight hundred twenty-three".