807999 has 4 divisors (see below), whose sum is σ = 1077336. Its totient is φ = 538664.

The previous prime is 807997. The next prime is 808019. The reversal of 807999 is 999708.

It is a happy number.

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 807999 - 2¹ = 807997 is a prime.

It is a D-number.

807999 is a modest number, since divided by 999 gives 807 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 807999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (807997) 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 in 3 ways as a sum of consecutive naturals, for example, 134664 + ... + 134669.

It is an arithmetic number, because the mean of its divisors is an integer number (269334).

2⁸⁰⁷⁹⁹⁹ is an apocalyptic number.

807999 is a deficient number, since it is larger than the sum of its proper divisors (269337).

807999 is a wasteful number, since it uses less digits than its factorization.

807999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269336.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 807999 is about 898.8876459269. The cubic root of 807999 is about 93.1401517319.

It can be divided in two parts, 80799 and 9, that added together give a palindrome (80808).

The spelling of 807999 in words is "eight hundred seven thousand, nine hundred ninety-nine".