3865705986 has 32 divisors (see below), whose sum is σ = 7799825088. Its totient is φ = 1277190720.

The previous prime is 3865705957. The next prime is 3865705999. The reversal of 3865705986 is 6895075683.

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, 781176 + ... + 786108.

It is an arithmetic number, because the mean of its divisors is an integer number (243744534).

Almost surely, 2^3865705986 is an apocalyptic number.

3865705986 is an abundant number, since it is smaller than the sum of its proper divisors (3934119102).

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

3865705986 is a wasteful number, since it uses less digits than its factorization.

3865705986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066.

The product of its (nonzero) digits is 10886400, while the sum is 57.

The square root of 3865705986 is about 62174.8018573441. The cubic root of 3865705986 is about 1569.4335774340.

The spelling of 3865705986 in words is "three billion, eight hundred sixty-five million, seven hundred five thousand, nine hundred eighty-six".