799866 has 24 divisors (see below), whose sum is σ = 1781364. Its totient is φ = 259200.

The previous prime is 799859. The next prime is 799873. The reversal of 799866 is 668997.

799866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (799859) and next prime (799873).

It can be written as a sum of positive squares in 2 ways, for example, as 783225 + 16641 = 885^2 + 129^2 .

It is an unprimeable number.

799866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66 + ... + 1266.

2⁷⁹⁹⁸⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 799866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (890682).

799866 is an abundant number, since it is smaller than the sum of its proper divisors (981498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

799866 is a wasteful number, since it uses less digits than its factorization.

799866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246 (or 1243 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 799866 is about 894.3522795856. The cubic root of 799866 is about 92.8265932753.

The spelling of 799866 in words is "seven hundred ninety-nine thousand, eight hundred sixty-six".