138501539 has 8 divisors (see below), whose sum is σ = 151190832. Its totient is φ = 125828640.

The previous prime is 138501523. The next prime is 138501563. The reversal of 138501539 is 935105831.

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 138501539 - 2⁴ = 138501523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138501499 and 138501508.

It is not an unprimeable number, because it can be changed into a prime (138501599) 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, 19517 + ... + 25649.

It is an arithmetic number, because the mean of its divisors is an integer number (18898854).

Almost surely, 2^138501539 is an apocalyptic number.

138501539 is a deficient number, since it is larger than the sum of its proper divisors (12689293).

138501539 is a wasteful number, since it uses less digits than its factorization.

138501539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8197.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 138501539 is about 11768.6676816027. The cubic root of 138501539 is about 517.3902016039.

The spelling of 138501539 in words is "one hundred thirty-eight million, five hundred one thousand, five hundred thirty-nine".