138340789889 has 4 divisors (see below), whose sum is σ = 138519756756. Its totient is φ = 138161823024.

The previous prime is 138340789877. The next prime is 138340789907. The reversal of 138340789889 is 988987043831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988987043831 = 37 ⋅26729379563.

It can be written as a sum of positive squares in 2 ways, for example, as 21677556289 + 116663233600 = 147233^2 + 341560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138340789889 is a prime.

It is a super-2 number, since 2×138340789889² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138340789289) 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, 89482274 + ... + 89483819.

It is an arithmetic number, because the mean of its divisors is an integer number (34629939189).

Almost surely, 2^138340789889 is an apocalyptic number.

It is an amenable number.

138340789889 is a deficient number, since it is larger than the sum of its proper divisors (178966867).

138340789889 is an equidigital number, since it uses as much as digits as its factorization.

138340789889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178966866.

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 138340789889 in words is "one hundred thirty-eight billion, three hundred forty million, seven hundred eighty-nine thousand, eight hundred eighty-nine".