138212728703999 has 4 divisors (see below), whose sum is σ = 138353331684336. Its totient is φ = 138072125723664.

The previous prime is 138212728703927. The next prime is 138212728704041. The reversal of 138212728703999 is 999307827212831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138212728703999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138214728703999) 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, 70301488694 + ... + 70301490659.

It is an arithmetic number, because the mean of its divisors is an integer number (34588332921084).

Almost surely, 2^{138212728703999} is an apocalyptic number.

138212728703999 is a deficient number, since it is larger than the sum of its proper divisors (140602980337).

138212728703999 is an equidigital number, since it uses as much as digits as its factorization.

138212728703999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140602980336.

The product of its (nonzero) digits is 164602368, while the sum is 71.

The spelling of 138212728703999 in words is "one hundred thirty-eight trillion, two hundred twelve billion, seven hundred twenty-eight million, seven hundred three thousand, nine hundred ninety-nine".