799999 has 2 divisors, whose sum is σ = 800000. Its totient is φ = 799998.

The previous prime is 799993. The next prime is 800011. The reversal of 799999 is 999997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 799999 - 2³ = 799991 is a prime.

799999 is a modest number, since divided by 999 gives 799 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (799991) 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 as a sum of consecutive naturals, namely, 399999 + 400000.

It is an arithmetic number, because the mean of its divisors is an integer number (400000).

2⁷⁹⁹⁹⁹⁹ is an apocalyptic number.

799999 is a deficient number, since it is larger than the sum of its proper divisors (1).

799999 is an equidigital number, since it uses as much as digits as its factorization.

799999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 413343, while the sum is 52.

The square root of 799999 is about 894.4266319827. The cubic root of 799999 is about 92.8317379923.

It can be divided in two parts, 79999 and 9, that added together give a palindrome (80008).

The spelling of 799999 in words is "seven hundred ninety-nine thousand, nine hundred ninety-nine".