123129228 has 12 divisors (see below), whose sum is σ = 287301560. Its totient is φ = 41043072.

The previous prime is 123129221. The next prime is 123129233. The reversal of 123129228 is 822921321.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 123129195 and 123129204.

It is not an unprimeable number, because it can be changed into a prime (123129221) 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, 5130373 + ... + 5130396.

Almost surely, 2^123129228 is an apocalyptic number.

It is an amenable number.

123129228 is an abundant number, since it is smaller than the sum of its proper divisors (164172332).

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

123129228 is a wasteful number, since it uses less digits than its factorization.

123129228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10260776 (or 10260774 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 123129228 is about 11096.3610251289. The cubic root of 123129228 is about 497.4930891358.

The spelling of 123129228 in words is "one hundred twenty-three million, one hundred twenty-nine thousand, two hundred twenty-eight".