3988899711729 has 81 divisors (see below), whose sum is σ = 6256352722347. Its totient is φ = 2448627353568.

The previous prime is 3988899711697. The next prime is 3988899711749. The reversal of 3988899711729 is 9271179988893.

The square root of 3988899711729 is 1997223.

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

3988899711729 is a `hidden beast` number, since 398 + 8 + 8 + 9 + 97 + 117 + 29 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3569322240225 + 419577471504 = 1889265^2 + 647748^2 .

It is not a de Polignac number, because 3988899711729 - 2⁵ = 3988899711697 is a prime.

It is a super-2 number, since 2×3988899711729² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3988899711749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4212142834 + ... + 4212143780.

Almost surely, 2^{3988899711729} is an apocalyptic number.

3988899711729 is the 1997223-rd square number.

3988899711729 is the 998612-nd centered octagonal number.

It is an amenable number.

3988899711729 is a deficient number, since it is larger than the sum of its proper divisors (2267453010618).

3988899711729 is an frugal number, since it uses more digits than its factorization.

3988899711729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012 (or 1006 counting only the distinct ones).

The product of its digits is 987614208, while the sum is 81.

Multiplying 3988899711729 by its sum of digits (81), we get a square (323100876650049 = 17975007²).

The spelling of 3988899711729 in words is "three trillion, nine hundred eighty-eight billion, eight hundred ninety-nine million, seven hundred eleven thousand, seven hundred twenty-nine".