138769789 has 4 divisors (see below), whose sum is σ = 142154460. Its totient is φ = 135385120.

The previous prime is 138769783. The next prime is 138769823. The reversal of 138769789 is 987967831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987967831 = 5527 ⋅178753.

It can be written as a sum of positive squares in 2 ways, for example, as 30713764 + 108056025 = 5542^2 + 10395^2 .

It is a cyclic number.

It is not a de Polignac number, because 138769789 - 2⁷ = 138769661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138769783) 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, 1692274 + ... + 1692355.

It is an arithmetic number, because the mean of its divisors is an integer number (35538615).

Almost surely, 2^138769789 is an apocalyptic number.

It is an amenable number.

138769789 is a deficient number, since it is larger than the sum of its proper divisors (3384671).

138769789 is an equidigital number, since it uses as much as digits as its factorization.

138769789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384670.

The product of its digits is 4572288, while the sum is 58.

The square root of 138769789 is about 11780.0589557099. The cubic root of 138769789 is about 517.7240135746.

The spelling of 138769789 in words is "one hundred thirty-eight million, seven hundred sixty-nine thousand, seven hundred eighty-nine".