138273239 has 8 divisors (see below), whose sum is σ = 149073792. Its totient is φ = 127496160.

The previous prime is 138273227. The next prime is 138273253. The reversal of 138273239 is 932372831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138273239 - 2⁸ = 138272983 is a prime.

It is a super-2 number, since 2×138273239² = 38238977247102242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138273739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7517 + ... + 18249.

It is an arithmetic number, because the mean of its divisors is an integer number (18634224).

Almost surely, 2^138273239 is an apocalyptic number.

138273239 is a deficient number, since it is larger than the sum of its proper divisors (10800553).

138273239 is a wasteful number, since it uses less digits than its factorization.

138273239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11737.

The product of its digits is 54432, while the sum is 38.

The square root of 138273239 is about 11758.9641975813. The cubic root of 138273239 is about 517.1057639849.

The spelling of 138273239 in words is "one hundred thirty-eight million, two hundred seventy-three thousand, two hundred thirty-nine".