138643159 has 4 divisors (see below), whose sum is σ = 139573800. Its totient is φ = 137712520.

The previous prime is 138643151. The next prime is 138643163. The reversal of 138643159 is 951346831.

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 138643159 - 2³ = 138643151 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138643151) 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, 465097 + ... + 465394.

It is an arithmetic number, because the mean of its divisors is an integer number (34893450).

Almost surely, 2^138643159 is an apocalyptic number.

138643159 is a deficient number, since it is larger than the sum of its proper divisors (930641).

138643159 is an equidigital number, since it uses as much as digits as its factorization.

138643159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930640.

The product of its digits is 77760, while the sum is 40.

The square root of 138643159 is about 11774.6829681312. The cubic root of 138643159 is about 517.5664880694.

The spelling of 138643159 in words is "one hundred thirty-eight million, six hundred forty-three thousand, one hundred fifty-nine".