39256685689 has 9 divisors (see below), whose sum is σ = 42511508109. Its totient is φ = 36234563040.

The previous prime is 39256685659. The next prime is 39256685717. The reversal of 39256685689 is 98658665293.

The square root of 39256685689 is 198133.

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

It can be written as a sum of positive squares in 4 ways, for example, as 247275625 + 39009410064 = 15725^2 + 197508^2 .

It is not a de Polignac number, because 39256685689 - 2¹⁵ = 39256652921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39256685659) 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, 2568109 + ... + 2583349.

It is an arithmetic number, because the mean of its divisors is an integer number (4723500901).

Almost surely, 2^39256685689 is an apocalyptic number.

39256685689 is the 198133-rd square number.

39256685689 is the 99067-th centered octagonal number.

It is an amenable number.

39256685689 is a deficient number, since it is larger than the sum of its proper divisors (3254822420).

39256685689 is an frugal number, since it uses more digits than its factorization.

39256685689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30508 (or 15254 counting only the distinct ones).

The product of its digits is 167961600, while the sum is 67.

The spelling of 39256685689 in words is "thirty-nine billion, two hundred fifty-six million, six hundred eighty-five thousand, six hundred eighty-nine".