128823123 has 24 divisors (see below), whose sum is σ = 202910400. Its totient is φ = 72065760.

The previous prime is 128823119. The next prime is 128823143. The reversal of 128823123 is 321328821.

It is not a de Polignac number, because 128823123 - 2² = 128823119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128823113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5973 + ... + 17126.

It is an arithmetic number, because the mean of its divisors is an integer number (8454600).

Almost surely, 2^128823123 is an apocalyptic number.

128823123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

128823123 is a deficient number, since it is larger than the sum of its proper divisors (74087277).

128823123 is a wasteful number, since it uses less digits than its factorization.

128823123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23139 (or 23126 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 128823123 is about 11350.0274449007. The cubic root of 128823123 is about 505.0463938033.

The spelling of 128823123 in words is "one hundred twenty-eight million, eight hundred twenty-three thousand, one hundred twenty-three".