3986928985 has 8 divisors (see below), whose sum is σ = 5152339080. Its totient is φ = 2944193664.

The previous prime is 3986928949. The next prime is 3986928991. The reversal of 3986928985 is 5898296893.

It can be written as a sum of positive squares in 4 ways, for example, as 200618896 + 3786310089 = 14164^2 + 61533^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3986928985 - 2¹³ = 3986920793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3986928985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30668620 + ... + 30668749.

It is an arithmetic number, because the mean of its divisors is an integer number (644042385).

Almost surely, 2^3986928985 is an apocalyptic number.

It is an amenable number.

3986928985 is a deficient number, since it is larger than the sum of its proper divisors (1165410095).

3986928985 is a wasteful number, since it uses less digits than its factorization.

3986928985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61337387.

The product of its digits is 67184640, while the sum is 67.

The square root of 3986928985 is about 63142.1331996314. The cubic root of 3986928985 is about 1585.6700865605.

The spelling of 3986928985 in words is "three billion, nine hundred eighty-six million, nine hundred twenty-eight thousand, nine hundred eighty-five".