138399273 has 20 divisors (see below), whose sum is σ = 208338768. Its totient is φ = 91554840.

The previous prime is 138399269. The next prime is 138399293. The reversal of 138399273 is 372993831.

It is not a de Polignac number, because 138399273 - 2² = 138399269 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138399253) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4090 + ... + 17132.

Almost surely, 2^138399273 is an apocalyptic number.

It is an amenable number.

138399273 is a deficient number, since it is larger than the sum of its proper divisors (69939495).

138399273 is a wasteful number, since it uses less digits than its factorization.

138399273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13186 (or 13177 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 138399273 is about 11764.3220374147. The cubic root of 138399273 is about 517.2628276775.

The spelling of 138399273 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, two hundred seventy-three".