138982076809 has 3 divisors (see below), whose sum is σ = 138982449613. Its totient is φ = 138981704006.

The previous prime is 138982076801. The next prime is 138982076833. The reversal of 138982076809 is 908670289831.

The square root of 138982076809 is 372803.

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, and also an emirpimes, since its reverse is a distinct semiprime: 908670289831 = 62743 ⋅14482417.

It is not a de Polignac number, because 138982076809 - 2³ = 138982076801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138982076801) 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, 186402 + ... + 559204.

Almost surely, 2^138982076809 is an apocalyptic number.

138982076809 is the 372803-rd square number.

138982076809 is the 186402-nd centered octagonal number.

It is an amenable number.

138982076809 is a deficient number, since it is larger than the sum of its proper divisors (372804).

138982076809 is an frugal number, since it uses more digits than its factorization.

138982076809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745606 (or 372803 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 138982076809 in words is "one hundred thirty-eight billion, nine hundred eighty-two million, seventy-six thousand, eight hundred nine".