138888888889 has 4 divisors (see below), whose sum is σ = 144927536256. Its totient is φ = 132850241524.

The previous prime is 138888888877. The next prime is 138888888907. The reversal of 138888888889 is 988888888831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988888888831 = 41 ⋅24119241191.

It is a cyclic number.

It is not a de Polignac number, because 138888888889 - 2²⁹ = 138352017977 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (138888888689) 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, 3019323649 + ... + 3019323694.

It is an arithmetic number, because the mean of its divisors is an integer number (36231884064).

Almost surely, 2^138888888889 is an apocalyptic number.

It is an amenable number.

138888888889 is a deficient number, since it is larger than the sum of its proper divisors (6038647367).

138888888889 is an equidigital number, since it uses as much as digits as its factorization.

138888888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6038647366.

The product of its digits is 3623878656, while the sum is 85.

The spelling of 138888888889 in words is "one hundred thirty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".