3860216978 has 6 divisors (see below), whose sum is σ = 5790457269. Its totient is φ = 1930064556.

The previous prime is 3860216977. The next prime is 3860217007. The reversal of 3860216978 is 8796120683.

It can be written as a sum of positive squares in 2 ways, for example, as 2667412609 + 1192804369 = 51647^2 + 34537^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=43933.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3860216977) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 65900 + ... + 109832.

Almost surely, 2^3860216978 is an apocalyptic number.

3860216978 is a deficient number, since it is larger than the sum of its proper divisors (1930240291).

3860216978 is an frugal number, since it uses more digits than its factorization.

3860216978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87868 (or 43935 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 3860216978 is about 62130.6444357372. The cubic root of 3860216978 is about 1568.6904001992.

Multiplying 3860216978 by its sum of digits (50), we get a square (193010848900 = 439330²).

The spelling of 3860216978 in words is "three billion, eight hundred sixty million, two hundred sixteen thousand, nine hundred seventy-eight".