798991 has 4 divisors (see below), whose sum is σ = 800800. Its totient is φ = 797184.

The previous prime is 798961. The next prime is 799003. The reversal of 798991 is 199897.

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 798991 - 2¹⁵ = 766223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (798911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250 + ... + 1288.

It is an arithmetic number, because the mean of its divisors is an integer number (200200).

2⁷⁹⁸⁹⁹¹ is an apocalyptic number.

798991 is a deficient number, since it is larger than the sum of its proper divisors (1809).

798991 is a wasteful number, since it uses less digits than its factorization.

798991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808.

The product of its digits is 40824, while the sum is 43.

The square root of 798991 is about 893.8629648889. The cubic root of 798991 is about 92.7927322266.

The spelling of 798991 in words is "seven hundred ninety-eight thousand, nine hundred ninety-one".