797991 has 8 divisors (see below), whose sum is σ = 1068144. Its totient is φ = 529920.

The previous prime is 797987. The next prime is 798023. The reversal of 797991 is 199797.

797991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 797991 - 2² = 797987 is a prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095 + ... + 1671.

It is an arithmetic number, because the mean of its divisors is an integer number (133518).

2⁷⁹⁷⁹⁹¹ is an apocalyptic number.

797991 is a deficient number, since it is larger than the sum of its proper divisors (270153).

797991 is a wasteful number, since it uses less digits than its factorization.

797991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its digits is 35721, while the sum is 42.

The square root of 797991 is about 893.3034198972. The cubic root of 797991 is about 92.7540036003.

It can be divided in two parts, 79799 and 1, that added together give a triangular number (79800 = T₃₉₉).

The spelling of 797991 in words is "seven hundred ninety-seven thousand, nine hundred ninety-one".