7987866 has 32 divisors (see below), whose sum is σ = 17236800. Its totient is φ = 2459520.

The previous prime is 7987843. The next prime is 7987867. The reversal of 7987866 is 6687897.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (7987867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3820 + ... + 5528.

It is an arithmetic number, because the mean of its divisors is an integer number (538650).

Almost surely, 2^7987866 is an apocalyptic number.

7987866 is an abundant number, since it is smaller than the sum of its proper divisors (9248934).

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

7987866 is a wasteful number, since it uses less digits than its factorization.

7987866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774.

The product of its digits is 1016064, while the sum is 51.

The square root of 7987866 is about 2826.2813023477. The cubic root of 7987866 is about 199.8988321673.

The spelling of 7987866 in words is "seven million, nine hundred eighty-seven thousand, eight hundred sixty-six".