7971986 has 8 divisors (see below), whose sum is σ = 13045104. Its totient is φ = 3623620.

The previous prime is 7971973. The next prime is 7972009. The reversal of 7971986 is 6891797.

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

It is a self number, because there is not a number n which added to its sum of digits gives 7971986.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181160 + ... + 181203.

It is an arithmetic number, because the mean of its divisors is an integer number (1630638).

Almost surely, 2^7971986 is an apocalyptic number.

7971986 is a deficient number, since it is larger than the sum of its proper divisors (5073118).

7971986 is a wasteful number, since it uses less digits than its factorization.

7971986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362376.

The product of its digits is 190512, while the sum is 47.

The square root of 7971986 is about 2823.4705594357. The cubic root of 7971986 is about 199.7662769741.

The spelling of 7971986 in words is "seven million, nine hundred seventy-one thousand, nine hundred eighty-six".