138273207 has 4 divisors (see below), whose sum is σ = 184364280. Its totient is φ = 92182136.

The previous prime is 138273199. The next prime is 138273227. The reversal of 138273207 is 702372831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 702372831 = 3 ⋅234124277.

It is a cyclic number.

It is not a de Polignac number, because 138273207 - 2³ = 138273199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138273227) 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, 23045532 + ... + 23045537.

It is an arithmetic number, because the mean of its divisors is an integer number (46091070).

Almost surely, 2^138273207 is an apocalyptic number.

138273207 is a deficient number, since it is larger than the sum of its proper divisors (46091073).

138273207 is an equidigital number, since it uses as much as digits as its factorization.

138273207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46091072.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 138273207 is about 11758.9628369172. The cubic root of 138273207 is about 517.1057240944.

The spelling of 138273207 in words is "one hundred thirty-eight million, two hundred seventy-three thousand, two hundred seven".