138225228 has 24 divisors (see below), whose sum is σ = 339501120. Its totient is φ = 43650000.

The previous prime is 138225203. The next prime is 138225233. The reversal of 138225228 is 822522831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302898 + ... + 303353.

It is an arithmetic number, because the mean of its divisors is an integer number (14145880).

Almost surely, 2^138225228 is an apocalyptic number.

It is an amenable number.

138225228 is an abundant number, since it is smaller than the sum of its proper divisors (201275892).

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

138225228 is a wasteful number, since it uses less digits than its factorization.

138225228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606277 (or 606275 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 138225228 is about 11756.9225565196. The cubic root of 138225228 is about 517.0459075273.

The spelling of 138225228 in words is "one hundred thirty-eight million, two hundred twenty-five thousand, two hundred twenty-eight".