7987859 has 4 divisors (see below), whose sum is σ = 8714040. Its totient is φ = 7261680.

The previous prime is 7987843. The next prime is 7987867. The reversal of 7987859 is 9587897.

7987859 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7987859 - 2⁴ = 7987843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7987859.

It is not an unprimeable number, because it can be changed into a prime (7987459) 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 3 ways as a sum of consecutive naturals, for example, 363074 + ... + 363095.

It is an arithmetic number, because the mean of its divisors is an integer number (2178510).

Almost surely, 2^7987859 is an apocalyptic number.

7987859 is a deficient number, since it is larger than the sum of its proper divisors (726181).

7987859 is a wasteful number, since it uses less digits than its factorization.

7987859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726180.

The product of its digits is 1270080, while the sum is 53.

The square root of 7987859 is about 2826.2800639710. The cubic root of 7987859 is about 199.8987737749.

The spelling of 7987859 in words is "seven million, nine hundred eighty-seven thousand, eight hundred fifty-nine".