138438238 has 8 divisors (see below), whose sum is σ = 213269832. Its totient is φ = 67348296.

The previous prime is 138438193. The next prime is 138438239. The reversal of 138438238 is 832834831.

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

It is a self number, because there is not a number n which added to its sum of digits gives 138438238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138438239) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 935320 + ... + 935467.

It is an arithmetic number, because the mean of its divisors is an integer number (26658729).

Almost surely, 2^138438238 is an apocalyptic number.

138438238 is a deficient number, since it is larger than the sum of its proper divisors (74831594).

138438238 is a wasteful number, since it uses less digits than its factorization.

138438238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870826.

The product of its digits is 110592, while the sum is 40.

The square root of 138438238 is about 11765.9779874008. The cubic root of 138438238 is about 517.3113666003.

The spelling of 138438238 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, two hundred thirty-eight".