798865 has 4 divisors (see below), whose sum is σ = 958644. Its totient is φ = 639088.

The previous prime is 798823. The next prime is 798871. The reversal of 798865 is 568897.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 222784 = 759^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 798865 - 2⁷ = 798737 is a prime.

It is a d-powerful number, because it can be written as 7³ + 9⁶ + 8⁴ + 8⁶ + 6³ + 5⁴ .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79882 + ... + 79891.

It is an arithmetic number, because the mean of its divisors is an integer number (239661).

2⁷⁹⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

798865 is a deficient number, since it is larger than the sum of its proper divisors (159779).

798865 is a wasteful number, since it uses less digits than its factorization.

798865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159778.

The product of its digits is 120960, while the sum is 43.

The square root of 798865 is about 893.7924815079. The cubic root of 798865 is about 92.7878541996.

The spelling of 798865 in words is "seven hundred ninety-eight thousand, eight hundred sixty-five".