138238207 has 16 divisors (see below), whose sum is σ = 145926144. Its totient is φ = 130788000.

The previous prime is 138238193. The next prime is 138238213. The reversal of 138238207 is 702832831.

It is a cyclic number.

It is not a de Polignac number, because 138238207 - 2¹¹ = 138236159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138238267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398208 + ... + 398554.

It is an arithmetic number, because the mean of its divisors is an integer number (9120384).

Almost surely, 2^138238207 is an apocalyptic number.

138238207 is a deficient number, since it is larger than the sum of its proper divisors (7687937).

138238207 is a wasteful number, since it uses less digits than its factorization.

138238207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 138238207 is about 11757.4745162386. The cubic root of 138238207 is about 517.0620901226.

The spelling of 138238207 in words is "one hundred thirty-eight million, two hundred thirty-eight thousand, two hundred seven".