138196228 has 12 divisors (see below), whose sum is σ = 246406860. Its totient is φ = 67794272.

The previous prime is 138196211. The next prime is 138196237. The reversal of 138196228 is 822691831.

It can be written as a sum of positive squares in 2 ways, for example, as 121484484 + 16711744 = 11022^2 + 4088^2 .

It is a super-3 number, since 3×138196228³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325723 + ... + 326146.

It is an arithmetic number, because the mean of its divisors is an integer number (20533905).

Almost surely, 2^138196228 is an apocalyptic number.

It is an amenable number.

138196228 is a deficient number, since it is larger than the sum of its proper divisors (108210632).

138196228 is a wasteful number, since it uses less digits than its factorization.

138196228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651926 (or 651924 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 138196228 is about 11755.6891758842. The cubic root of 138196228 is about 517.0097458215.

The spelling of 138196228 in words is "one hundred thirty-eight million, one hundred ninety-six thousand, two hundred twenty-eight".