138759289 has 4 divisors (see below), whose sum is σ = 140032420. Its totient is φ = 137486160.

The previous prime is 138759263. The next prime is 138759301. The reversal of 138759289 is 982957831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982957831 = 23 ⋅42737297.

It can be written as a sum of positive squares in 2 ways, for example, as 120824064 + 17935225 = 10992^2 + 4235^2 .

It is a cyclic number.

It is not a de Polignac number, because 138759289 - 2¹⁵ = 138726521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138759889) 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, 636402 + ... + 636619.

It is an arithmetic number, because the mean of its divisors is an integer number (35008105).

Almost surely, 2^138759289 is an apocalyptic number.

It is an amenable number.

138759289 is a deficient number, since it is larger than the sum of its proper divisors (1273131).

138759289 is a wasteful number, since it uses less digits than its factorization.

138759289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273130.

The product of its digits is 1088640, while the sum is 52.

The square root of 138759289 is about 11779.6132788814. The cubic root of 138759289 is about 517.7109554027.

The spelling of 138759289 in words is "one hundred thirty-eight million, seven hundred fifty-nine thousand, two hundred eighty-nine".