3989368218447 has 20 divisors (see below), whose sum is σ = 5974986504960. Its totient is φ = 2652634721664.

The previous prime is 3989368218443. The next prime is 3989368218481. The reversal of 3989368218447 is 7448128639893.

3989368218447 is a `hidden beast` number, since 3 + 9 + 8 + 9 + 368 + 218 + 4 + 47 = 666.

It is not a de Polignac number, because 3989368218447 - 2² = 3989368218443 is a prime.

It is a super-2 number, since 2×3989368218447² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989368218443) 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 19 ways as a sum of consecutive naturals, for example, 64265922 + ... + 64327967.

It is an arithmetic number, because the mean of its divisors is an integer number (298749325248).

Almost surely, 2^{3989368218447} is an apocalyptic number.

3989368218447 is a deficient number, since it is larger than the sum of its proper divisors (1985618286513).

3989368218447 is a wasteful number, since it uses less digits than its factorization.

3989368218447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128594284 (or 128594275 counting only the distinct ones).

The product of its digits is 501645312, while the sum is 72.

The spelling of 3989368218447 in words is "three trillion, nine hundred eighty-nine billion, three hundred sixty-eight million, two hundred eighteen thousand, four hundred forty-seven".