864799 has 4 divisors (see below), whose sum is σ = 931336. Its totient is φ = 798264.

The previous prime is 864793. The next prime is 864803. The reversal of 864799 is 997468.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864799 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 (864793) 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 3 ways as a sum of consecutive naturals, for example, 33249 + ... + 33274.

It is an arithmetic number, because the mean of its divisors is an integer number (232834).

2⁸⁶⁴⁷⁹⁹ is an apocalyptic number.

864799 is a deficient number, since it is larger than the sum of its proper divisors (66537).

864799 is a wasteful number, since it uses less digits than its factorization.

864799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66536.

The product of its digits is 108864, while the sum is 43.

The square root of 864799 is about 929.9456973394. The cubic root of 864799 is about 95.2734136429.

The spelling of 864799 in words is "eight hundred sixty-four thousand, seven hundred ninety-nine".