138642222 has 16 divisors (see below), whose sum is σ = 278530560. Its totient is φ = 46006392.

The previous prime is 138642209. The next prime is 138642247. The reversal of 138642222 is 222246831.

138642222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×138642222³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138642222.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 50472 + ... + 53147.

It is an arithmetic number, because the mean of its divisors is an integer number (17408160).

Almost surely, 2^138642222 is an apocalyptic number.

138642222 is an abundant number, since it is smaller than the sum of its proper divisors (139888338).

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

138642222 is a wasteful number, since it uses less digits than its factorization.

138642222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103847.

The product of its digits is 9216, while the sum is 30.

The square root of 138642222 is about 11774.6431793070. The cubic root of 138642222 is about 517.5653221004.

The spelling of 138642222 in words is "one hundred thirty-eight million, six hundred forty-two thousand, two hundred twenty-two".