3978243723986 has 16 divisors (see below), whose sum is σ = 6819893086464. Its totient is φ = 1704949920384.

The previous prime is 3978243723953. The next prime is 3978243724003. The reversal of 3978243723986 is 6893273428793.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332866 + ... + 3119778.

It is an arithmetic number, because the mean of its divisors is an integer number (426243317904).

Almost surely, 2^{3978243723986} is an apocalyptic number.

3978243723986 is a deficient number, since it is larger than the sum of its proper divisors (2841649362478).

3978243723986 is a wasteful number, since it uses less digits than its factorization.

3978243723986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945945.

The product of its digits is 658409472, while the sum is 71.

The spelling of 3978243723986 in words is "three trillion, nine hundred seventy-eight billion, two hundred forty-three million, seven hundred twenty-three thousand, nine hundred eighty-six".