799987 has 4 divisors (see below), whose sum is σ = 817056. Its totient is φ = 782920.

The previous prime is 799979. The next prime is 799991. The reversal of 799987 is 789997.

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 799987 - 2³ = 799979 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 799987.

It is not an unprimeable number, because it can be changed into a prime (797987) 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, 8464 + ... + 8557.

It is an arithmetic number, because the mean of its divisors is an integer number (204264).

2⁷⁹⁹⁹⁸⁷ is an apocalyptic number.

799987 is a deficient number, since it is larger than the sum of its proper divisors (17069).

799987 is a wasteful number, since it uses less digits than its factorization.

799987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17068.

The product of its digits is 285768, while the sum is 49.

The square root of 799987 is about 894.4199237495. The cubic root of 799987 is about 92.8312738307.

The spelling of 799987 in words is "seven hundred ninety-nine thousand, nine hundred eighty-seven".