138051439 has 4 divisors (see below), whose sum is σ = 138085560. Its totient is φ = 138017320.

The previous prime is 138051437. The next prime is 138051481. The reversal of 138051439 is 934150831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934150831 = 1249 ⋅747919.

It is a cyclic number.

It is not a de Polignac number, because 138051439 - 2¹ = 138051437 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 (138051437) 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, 10024 + ... + 19405.

It is an arithmetic number, because the mean of its divisors is an integer number (34521390).

Almost surely, 2^138051439 is an apocalyptic number.

138051439 is a deficient number, since it is larger than the sum of its proper divisors (34121).

138051439 is an equidigital number, since it uses as much as digits as its factorization.

138051439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34120.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 138051439 is about 11749.5293097213. The cubic root of 138051439 is about 516.8291246782.

The spelling of 138051439 in words is "one hundred thirty-eight million, fifty-one thousand, four hundred thirty-nine".