799681 has 4 divisors (see below), whose sum is σ = 821332. Its totient is φ = 778032.

The previous prime is 799679. The next prime is 799723. The reversal of 799681 is 186997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186997 = 67 ⋅2791.

It can be written as a sum of positive squares in 2 ways, for example, as 774400 + 25281 = 880^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 799681 - 2¹ = 799679 is a prime.

It is a super-2 number, since 2×799681² = 1278979403522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (799621) 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, 10770 + ... + 10843.

It is an arithmetic number, because the mean of its divisors is an integer number (205333).

2⁷⁹⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

799681 is a deficient number, since it is larger than the sum of its proper divisors (21651).

799681 is a wasteful number, since it uses less digits than its factorization.

799681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21650.

The product of its digits is 27216, while the sum is 40.

The square root of 799681 is about 894.2488467983. The cubic root of 799681 is about 92.8194361415.

The spelling of 799681 in words is "seven hundred ninety-nine thousand, six hundred eighty-one".