138726028523 has 4 divisors (see below), whose sum is σ = 146886383160. Its totient is φ = 130565673888.

The previous prime is 138726028517. The next prime is 138726028531. The reversal of 138726028523 is 325820627831.

138726028523 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: 325820627831 = 83399 ⋅3906769.

It is a cyclic number.

It is not a de Polignac number, because 138726028523 - 2⁶ = 138726028459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138725028523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4080177293 + ... + 4080177326.

It is an arithmetic number, because the mean of its divisors is an integer number (36721595790).

Almost surely, 2^138726028523 is an apocalyptic number.

138726028523 is a deficient number, since it is larger than the sum of its proper divisors (8160354637).

138726028523 is an equidigital number, since it uses as much as digits as its factorization.

138726028523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8160354636.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 138726028523 in words is "one hundred thirty-eight billion, seven hundred twenty-six million, twenty-eight thousand, five hundred twenty-three".