123128 has 8 divisors (see below), whose sum is σ = 230880. Its totient is φ = 61560.

The previous prime is 123127. The next prime is 123143. The reversal of 123128 is 821321.

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7688 + ... + 7703.

It is an arithmetic number, because the mean of its divisors is an integer number (28860).

2¹²³¹²⁸ is an apocalyptic number.

It is an amenable number.

123128 is a deficient number, since it is larger than the sum of its proper divisors (107752).

123128 is a wasteful number, since it uses less digits than its factorization.

123128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15397 (or 15393 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 123128 is about 350.8959959874. The cubic root of 123128 is about 49.7491435254.

Adding to 123128 its reverse (821321), we get a palindrome (944449).

The spelling of 123128 in words is "one hundred twenty-three thousand, one hundred twenty-eight".