3856381986 has 32 divisors (see below), whose sum is σ = 8235279360. Its totient is φ = 1200974544.

The previous prime is 3856381961. The next prime is 3856381993. The reversal of 3856381986 is 6891836583.

It is a super-3 number, since 3×3856381986³ (a number of 30 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319006 + ... + 330873.

It is an arithmetic number, because the mean of its divisors is an integer number (257352480).

Almost surely, 2^3856381986 is an apocalyptic number.

3856381986 is an abundant number, since it is smaller than the sum of its proper divisors (4378897374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3856381986 is a wasteful number, since it uses less digits than its factorization.

3856381986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649950.

The product of its digits is 7464960, while the sum is 57.

The square root of 3856381986 is about 62099.7744440348. The cubic root of 3856381986 is about 1568.1707481977.

The spelling of 3856381986 in words is "three billion, eight hundred fifty-six million, three hundred eighty-one thousand, nine hundred eighty-six".