138064539 has 4 divisors (see below), whose sum is σ = 184086056. Its totient is φ = 92043024.

The previous prime is 138064477. The next prime is 138064567. The reversal of 138064539 is 935460831.

138064539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935460831 = 3 ⋅311820277.

It is not a de Polignac number, because 138064539 - 2¹⁵ = 138031771 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138064497 and 138064506.

It is not an unprimeable number, because it can be changed into a prime (138064439) 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, 23010754 + ... + 23010759.

It is an arithmetic number, because the mean of its divisors is an integer number (46021514).

Almost surely, 2^138064539 is an apocalyptic number.

138064539 is a deficient number, since it is larger than the sum of its proper divisors (46021517).

138064539 is an equidigital number, since it uses as much as digits as its factorization.

138064539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46021516.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 138064539 is about 11750.0867656371. The cubic root of 138064539 is about 516.8454718394.

The spelling of 138064539 in words is "one hundred thirty-eight million, sixty-four thousand, five hundred thirty-nine".