138208547 has 4 divisors (see below), whose sum is σ = 138235920. Its totient is φ = 138181176.

The previous prime is 138208531. The next prime is 138208549. The reversal of 138208547 is 745802831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138208547 - 2⁴ = 138208531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138208547.

It is not an unprimeable number, because it can be changed into a prime (138208549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3668 + ... + 17025.

It is an arithmetic number, because the mean of its divisors is an integer number (34558980).

Almost surely, 2^138208547 is an apocalyptic number.

138208547 is a deficient number, since it is larger than the sum of its proper divisors (27373).

138208547 is an equidigital number, since it uses as much as digits as its factorization.

138208547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27372.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 138208547 is about 11756.2131232808. The cubic root of 138208547 is about 517.0251076827.

The spelling of 138208547 in words is "one hundred thirty-eight million, two hundred eight thousand, five hundred forty-seven".