138786238 has 8 divisors (see below), whose sum is σ = 208849680. Its totient is φ = 69169680.

The previous prime is 138786233. The next prime is 138786239. The reversal of 138786238 is 832687831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138786233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110943 + ... + 112186.

It is an arithmetic number, because the mean of its divisors is an integer number (26106210).

Almost surely, 2^138786238 is an apocalyptic number.

138786238 is a deficient number, since it is larger than the sum of its proper divisors (70063442).

138786238 is a wasteful number, since it uses less digits than its factorization.

138786238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223442.

The product of its digits is 387072, while the sum is 46.

The square root of 138786238 is about 11780.7571064003. The cubic root of 138786238 is about 517.7444688094.

The spelling of 138786238 in words is "one hundred thirty-eight million, seven hundred eighty-six thousand, two hundred thirty-eight".