3998998986 has 16 divisors (see below), whose sum is σ = 8039440704. Its totient is φ = 1326092544.

The previous prime is 3998998979. The next prime is 3998999009. The reversal of 3998998986 is 6898998993.

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, 1725526 + ... + 1727841.

It is an arithmetic number, because the mean of its divisors is an integer number (502465044).

Almost surely, 2^3998998986 is an apocalyptic number.

3998998986 is an abundant number, since it is smaller than the sum of its proper divisors (4040441718).

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

3998998986 is a wasteful number, since it uses less digits than its factorization.

3998998986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453565.

The product of its digits is 544195584, while the sum is 78.

The square root of 3998998986 is about 63237.6389976729. The cubic root of 3998998986 is about 1587.2686233643.

The spelling of 3998998986 in words is "three billion, nine hundred ninety-eight million, nine hundred ninety-eight thousand, nine hundred eighty-six".