138320212 has 24 divisors (see below), whose sum is σ = 246480192. Its totient is φ = 67905600.

The previous prime is 138320197. The next prime is 138320213. The reversal of 138320212 is 212023831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138320213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79512 + ... + 81232.

It is an arithmetic number, because the mean of its divisors is an integer number (10270008).

Almost surely, 2^138320212 is an apocalyptic number.

It is an amenable number.

138320212 is a deficient number, since it is larger than the sum of its proper divisors (108159980).

138320212 is a wasteful number, since it uses less digits than its factorization.

138320212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079 (or 2077 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 138320212 is about 11760.9613552634. The cubic root of 138320212 is about 517.1643129353.

The spelling of 138320212 in words is "one hundred thirty-eight million, three hundred twenty thousand, two hundred twelve".