7998559 has 4 divisors (see below), whose sum is σ = 8184616. Its totient is φ = 7812504.

The previous prime is 7998553. The next prime is 7998569. The reversal of 7998559 is 9558997.

7998559 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, and also an emirpimes, since its reverse is a distinct semiprime: 9558997 = 7 ⋅1365571.

It is a cyclic number.

It is not a de Polignac number, because 7998559 - 2⁹ = 7998047 is a prime.

It is a Duffinian number.

7998559 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998553) 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, 92964 + ... + 93049.

It is an arithmetic number, because the mean of its divisors is an integer number (2046154).

Almost surely, 2^7998559 is an apocalyptic number.

7998559 is a deficient number, since it is larger than the sum of its proper divisors (186057).

7998559 is a wasteful number, since it uses less digits than its factorization.

7998559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186056.

The product of its digits is 1020600, while the sum is 52.

The square root of 7998559 is about 2828.1723780562. The cubic root of 7998559 is about 199.9879909456.

The spelling of 7998559 in words is "seven million, nine hundred ninety-eight thousand, five hundred fifty-nine".