12738959689 has 9 divisors (see below), whose sum is σ = 12965311303. Its totient is φ = 12516498832.

The previous prime is 12738959687. The next prime is 12738959719. The reversal of 12738959689 is 98695983721.

The square root of 12738959689 is 112867.

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

It can be written as a sum of positive squares in only one way, i.e., 11091249225 + 1647710464 = 105315^2 + 40592^2 .

It is not a de Polignac number, because 12738959689 - 2¹ = 12738959687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12738959683) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6658197 + ... + 6660109.

Almost surely, 2^12738959689 is an apocalyptic number.

12738959689 is the 112867-th square number.

12738959689 is the 56434-th centered octagonal number.

It is an amenable number.

12738959689 is a deficient number, since it is larger than the sum of its proper divisors (226351614).

12738959689 is an frugal number, since it uses more digits than its factorization.

12738959689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944 (or 1972 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 67.

The spelling of 12738959689 in words is "twelve billion, seven hundred thirty-eight million, nine hundred fifty-nine thousand, six hundred eighty-nine".