138272238 has 64 divisors (see below), whose sum is σ = 336436800. Its totient is φ = 41834880.

The previous prime is 138272231. The next prime is 138272243. The reversal of 138272238 is 832272831.

It is a happy number.

138272238 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138272231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41208 + ... + 44436.

It is an arithmetic number, because the mean of its divisors is an integer number (5256825).

Almost surely, 2^138272238 is an apocalyptic number.

138272238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138272238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168218400).

138272238 is an abundant number, since it is smaller than the sum of its proper divisors (198164562).

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

138272238 is a wasteful number, since it uses less digits than its factorization.

138272238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3314 (or 3308 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 138272238 is about 11758.9216342316. The cubic root of 138272238 is about 517.1045161558.

The spelling of 138272238 in words is "one hundred thirty-eight million, two hundred seventy-two thousand, two hundred thirty-eight".