3885720115729 has 9 divisors (see below), whose sum is σ = 3893809055227. Its totient is φ = 3877647957544.

The previous prime is 3885720115723. The next prime is 3885720115733. The reversal of 3885720115729 is 9275110275883.

It is a happy number.

The square root of 3885720115729 is 1971223.

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., 340980084225 + 3544740031504 = 583935^2 + 1882748^2 .

It is not a de Polignac number, because 3885720115729 - 2²¹ = 3885718018577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3885720115723) 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, 1097969442 + ... + 1097972980.

Almost surely, 2^{3885720115729} is an apocalyptic number.

3885720115729 is the 1971223-rd square number.

3885720115729 is the 985612-nd centered octagonal number.

It is an amenable number.

3885720115729 is a deficient number, since it is larger than the sum of its proper divisors (8088939498).

3885720115729 is an frugal number, since it uses more digits than its factorization.

3885720115729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8192 (or 4096 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 58.

The spelling of 3885720115729 in words is "three trillion, eight hundred eighty-five billion, seven hundred twenty million, one hundred fifteen thousand, seven hundred twenty-nine".