138738889 has 4 divisors (see below), whose sum is σ = 138784720. Its totient is φ = 138693060.

The previous prime is 138738883. The next prime is 138738911. The reversal of 138738889 is 988837831.

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.

It is a cyclic number.

It is not a de Polignac number, because 138738889 - 2³ = 138738881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138738881) 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, 18027 + ... + 24544.

It is an arithmetic number, because the mean of its divisors is an integer number (34696180).

Almost surely, 2^138738889 is an apocalyptic number.

It is an amenable number.

138738889 is a deficient number, since it is larger than the sum of its proper divisors (45831).

138738889 is an equidigital number, since it uses as much as digits as its factorization.

138738889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45830.

The product of its digits is 2322432, while the sum is 55.

The square root of 138738889 is about 11778.7473442637. The cubic root of 138738889 is about 517.6855833570.

The spelling of 138738889 in words is "one hundred thirty-eight million, seven hundred thirty-eight thousand, eight hundred eighty-nine".