3865121115728 has 20 divisors (see below), whose sum is σ = 7527879875328. Its totient is φ = 1922442438240.

The previous prime is 3865121115707. The next prime is 3865121115733. The reversal of 3865121115728 is 8275111215683.

It is a super-2 number, since 2×3865121115728² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632379326 + ... + 632385437.

Almost surely, 2^{3865121115728} is an apocalyptic number.

It is an amenable number.

3865121115728 is a deficient number, since it is larger than the sum of its proper divisors (3662758759600).

3865121115728 is a wasteful number, since it uses less digits than its factorization.

3865121115728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264764962 (or 1264764956 counting only the distinct ones).

The product of its digits is 806400, while the sum is 50.

The spelling of 3865121115728 in words is "three trillion, eight hundred sixty-five billion, one hundred twenty-one million, one hundred fifteen thousand, seven hundred twenty-eight".