138839089 has 3 divisors (see below), whose sum is σ = 138850873. Its totient is φ = 138827306.

The previous prime is 138839087. The next prime is 138839093. The reversal of 138839089 is 980938831.

The square root of 138839089 is 11783.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 138839089 - 2¹ = 138839087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138839087) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5892 + ... + 17674.

Almost surely, 2^138839089 is an apocalyptic number.

138839089 is the 11783-rd square number.

138839089 is the 5892-nd centered octagonal number.

It is an amenable number.

138839089 is a deficient number, since it is larger than the sum of its proper divisors (11784).

138839089 is an frugal number, since it uses more digits than its factorization.

138839089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23566 (or 11783 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The cubic root of 138839089 is about 517.8101809930.

Multiplying 138839089 by its sum of digits (49), we get a square (6803115361 = 82481²).

The spelling of 138839089 in words is "one hundred thirty-eight million, eight hundred thirty-nine thousand, eighty-nine".