138107489 has 4 divisors (see below), whose sum is σ = 148731156. Its totient is φ = 127483824.

The previous prime is 138107471. The next prime is 138107509. The reversal of 138107489 is 984701831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984701831 = 37 ⋅26613563.

It can be written as a sum of positive squares in 2 ways, for example, as 29593600 + 108513889 = 5440^2 + 10417^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138107489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138107419) 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, 5311814 + ... + 5311839.

It is an arithmetic number, because the mean of its divisors is an integer number (37182789).

Almost surely, 2^138107489 is an apocalyptic number.

It is an amenable number.

138107489 is a deficient number, since it is larger than the sum of its proper divisors (10623667).

138107489 is a wasteful number, since it uses less digits than its factorization.

138107489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10623666.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 138107489 is about 11751.9142695988. The cubic root of 138107489 is about 516.8990608147.

The spelling of 138107489 in words is "one hundred thirty-eight million, one hundred seven thousand, four hundred eighty-nine".