138858188 has 24 divisors (see below), whose sum is σ = 285224352. Its totient is φ = 57901824.

The previous prime is 138858157. The next prime is 138858217. The reversal of 138858188 is 881858831.

It is a happy number.

138858188 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 65981 + ... + 68052.

It is an arithmetic number, because the mean of its divisors is an integer number (11884348).

Almost surely, 2^138858188 is an apocalyptic number.

It is an amenable number.

138858188 is an abundant number, since it is smaller than the sum of its proper divisors (146366164).

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

138858188 is a wasteful number, since it uses less digits than its factorization.

138858188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134081 (or 134079 counting only the distinct ones).

The product of its digits is 491520, while the sum is 50.

The square root of 138858188 is about 11783.8104193847. The cubic root of 138858188 is about 517.8339235938.

The spelling of 138858188 in words is "one hundred thirty-eight million, eight hundred fifty-eight thousand, one hundred eighty-eight".