138090188 has 12 divisors (see below), whose sum is σ = 242206440. Its totient is φ = 68888352.

The previous prime is 138090187. The next prime is 138090191. The reversal of 138090188 is 881090831.

It is not an unprimeable number, because it can be changed into a prime (138090187) 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 3 ways as a sum of consecutive naturals, for example, 37193 + ... + 40736.

It is an arithmetic number, because the mean of its divisors is an integer number (20183870).

Almost surely, 2^138090188 is an apocalyptic number.

It is an amenable number.

138090188 is a deficient number, since it is larger than the sum of its proper divisors (104116252).

138090188 is a wasteful number, since it uses less digits than its factorization.

138090188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78376 (or 78374 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 138090188 is about 11751.1781537002. The cubic root of 138090188 is about 516.8774755887.

The spelling of 138090188 in words is "one hundred thirty-eight million, ninety thousand, one hundred eighty-eight".