138039273 has 12 divisors (see below), whose sum is σ = 199788420. Its totient is φ = 91842336.

The previous prime is 138039271. The next prime is 138039281. The reversal of 138039273 is 372930831.

It is a happy number.

138039273 is a `hidden beast` number, since 1 + 380 + 3 + 9 + 273 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 78641424 + 59397849 = 8868^2 + 7707^2 .

It is not a de Polignac number, because 138039273 - 2¹ = 138039271 is a prime.

It is a super-3 number, since 3×138039273³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138039271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10486 + ... + 19647.

It is an arithmetic number, because the mean of its divisors is an integer number (16649035).

Almost surely, 2^138039273 is an apocalyptic number.

It is an amenable number.

138039273 is a deficient number, since it is larger than the sum of its proper divisors (61749147).

138039273 is a wasteful number, since it uses less digits than its factorization.

138039273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30648 (or 30645 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 138039273 is about 11749.0115754475. The cubic root of 138039273 is about 516.8139421059.

The spelling of 138039273 in words is "one hundred thirty-eight million, thirty-nine thousand, two hundred seventy-three".