7998659 has 2 divisors, whose sum is σ = 7998660. Its totient is φ = 7998658.

The previous prime is 7998643. The next prime is 7998667. The reversal of 7998659 is 9568997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7998659 - 2⁴ = 7998643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7998659.

It is not a weakly prime, because it can be changed into another prime (7998629) by changing a digit.

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 as a sum of consecutive naturals, namely, 3999329 + 3999330.

It is an arithmetic number, because the mean of its divisors is an integer number (3999330).

Almost surely, 2^7998659 is an apocalyptic number.

7998659 is a deficient number, since it is larger than the sum of its proper divisors (1).

7998659 is an equidigital number, since it uses as much as digits as its factorization.

7998659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 53.

The square root of 7998659 is about 2828.1900572628. The cubic root of 7998659 is about 199.9888243755.

It can be divided in two parts, 79986 and 59, that multiplied together give a palindrome (4719174).

The spelling of 7998659 in words is "seven million, nine hundred ninety-eight thousand, six hundred fifty-nine".