123542128 has 20 divisors (see below), whose sum is σ = 253443600. Its totient is φ = 58137344.

The previous prime is 123542119. The next prime is 123542129. The reversal of 123542128 is 821245321.

It is a junction number, because it is equal to n+sod(n) for n = 123542096 and 123542105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123542129) 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, 226828 + ... + 227371.

It is an arithmetic number, because the mean of its divisors is an integer number (12672180).

Almost surely, 2^123542128 is an apocalyptic number.

It is an amenable number.

123542128 is an abundant number, since it is smaller than the sum of its proper divisors (129901472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123542128 is a wasteful number, since it uses less digits than its factorization.

123542128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454224 (or 454218 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 123542128 is about 11114.9506521622. The cubic root of 123542128 is about 498.0485643730.

Adding to 123542128 its reverse (821245321), we get a palindrome (944787449).

The spelling of 123542128 in words is "one hundred twenty-three million, five hundred forty-two thousand, one hundred twenty-eight".