799981 has 16 divisors (see below), whose sum is σ = 1008000. Its totient is φ = 618048.

The previous prime is 799979. The next prime is 799991. The reversal of 799981 is 189997.

It is a cyclic number.

It is not a de Polignac number, because 799981 - 2¹ = 799979 is a prime.

It is a super-2 number, since 2×799981² = 1279939200722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5295 + ... + 5443.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2⁷⁹⁹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

799981 is a deficient number, since it is larger than the sum of its proper divisors (208019).

799981 is a wasteful number, since it uses less digits than its factorization.

799981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

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

The square root of 799981 is about 894.4165696140. The cubic root of 799981 is about 92.8310417482.

The spelling of 799981 in words is "seven hundred ninety-nine thousand, nine hundred eighty-one".