138928128279 has 4 divisors (see below), whose sum is σ = 185237504376. Its totient is φ = 92618752184.

The previous prime is 138928128257. The next prime is 138928128341. The reversal of 138928128279 is 972821829831.

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 138928128279 - 2⁵ = 138928128247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138928128979) 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, 23154688044 + ... + 23154688049.

It is an arithmetic number, because the mean of its divisors is an integer number (46309376094).

Almost surely, 2^138928128279 is an apocalyptic number.

138928128279 is a deficient number, since it is larger than the sum of its proper divisors (46309376097).

138928128279 is an equidigital number, since it uses as much as digits as its factorization.

138928128279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46309376096.

The product of its digits is 6967296, while the sum is 60.

The spelling of 138928128279 in words is "one hundred thirty-eight billion, nine hundred twenty-eight million, one hundred twenty-eight thousand, two hundred seventy-nine".