139728682809 has 9 divisors (see below), whose sum is σ = 201831939439. Its totient is φ = 93151707600.

The previous prime is 139728682787. The next prime is 139728682817. The reversal of 139728682809 is 908286827931.

The square root of 139728682809 is 373803.

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

139728682809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 57886916409 + 81841766400 = 240597^2 + 286080^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 139728682809 - 2⁹ = 139728682297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139728682859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1059109 + ... + 1183709.

Almost surely, 2^139728682809 is an apocalyptic number.

139728682809 is the 373803-rd square number.

139728682809 is the 186902-nd centered octagonal number.

It is an amenable number.

139728682809 is a deficient number, since it is larger than the sum of its proper divisors (62103256630).

139728682809 is an frugal number, since it uses more digits than its factorization.

139728682809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249208 (or 124604 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 139728682809 in words is "one hundred thirty-nine billion, seven hundred twenty-eight million, six hundred eighty-two thousand, eight hundred nine".