799821 has 16 divisors (see below), whose sum is σ = 1293120. Its totient is φ = 484560.

The previous prime is 799817. The next prime is 799837. The reversal of 799821 is 128997.

It is a happy number.

It is not a de Polignac number, because 799821 - 2² = 799817 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1050 + ... + 1643.

It is an arithmetic number, because the mean of its divisors is an integer number (80820).

2⁷⁹⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

799821 is a deficient number, since it is larger than the sum of its proper divisors (493299).

799821 is a wasteful number, since it uses less digits than its factorization.

799821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713 (or 2707 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 799821 is about 894.3271213600. The cubic root of 799821 is about 92.8248524525.

The spelling of 799821 in words is "seven hundred ninety-nine thousand, eight hundred twenty-one".