3943139518756 has 9 divisors (see below), whose sum is σ = 6900501107899. Its totient is φ = 1971567773644.

The previous prime is 3943139518733. The next prime is 3943139518867. The reversal of 3943139518756 is 6578159313493.

The square root of 3943139518756 is 1985734.

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

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 3475035 + ... + 4467901.

Almost surely, 2^{3943139518756} is an apocalyptic number.

3943139518756 is the 1985734-th square number.

It is an amenable number.

3943139518756 is a deficient number, since it is larger than the sum of its proper divisors (2957361589143).

3943139518756 is an frugal number, since it uses more digits than its factorization.

3943139518756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985738 (or 992869 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 64.

Multiplying 3943139518756 by its sum of digits (64), we get a square (252360929200384 = 15885872²).

The spelling of 3943139518756 in words is "three trillion, nine hundred forty-three billion, one hundred thirty-nine million, five hundred eighteen thousand, seven hundred fifty-six".