3981362866 has 48 divisors (see below), whose sum is σ = 6859289304. Its totient is φ = 1722498048.

The previous prime is 3981362807. The next prime is 3981362881. The reversal of 3981362866 is 6682631893.

It can be written as a sum of positive squares in 4 ways, for example, as 2799997225 + 1181365641 = 52915^2 + 34371^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 908256 + ... + 912628.

Almost surely, 2^3981362866 is an apocalyptic number.

3981362866 is a deficient number, since it is larger than the sum of its proper divisors (2877926438).

3981362866 is a wasteful number, since it uses less digits than its factorization.

3981362866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523 (or 4504 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 52.

The square root of 3981362866 is about 63098.0416970289. The cubic root of 3981362866 is about 1584.9318292089.

The spelling of 3981362866 in words is "three billion, nine hundred eighty-one million, three hundred sixty-two thousand, eight hundred sixty-six".