3981236186 has 16 divisors (see below), whose sum is σ = 6217281384. Its totient is φ = 1910283264.

The previous prime is 3981236173. The next prime is 3981236209. The reversal of 3981236186 is 6816321893.

It can be written as a sum of positive squares in 4 ways, for example, as 3878922961 + 102313225 = 62281^2 + 10115^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3981236186.

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, 363095 + ... + 373898.

Almost surely, 2^3981236186 is an apocalyptic number.

3981236186 is a deficient number, since it is larger than the sum of its proper divisors (2236045198).

3981236186 is a wasteful number, since it uses less digits than its factorization.

3981236186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737105.

The product of its digits is 373248, while the sum is 47.

The square root of 3981236186 is about 63097.0378544033. The cubic root of 3981236186 is about 1584.9150191114.

The spelling of 3981236186 in words is "three billion, nine hundred eighty-one million, two hundred thirty-six thousand, one hundred eighty-six".