864899 has 12 divisors (see below), whose sum is σ = 1060200. Its totient is φ = 701568.

The previous prime is 864887. The next prime is 864901. The reversal of 864899 is 998468.

It is a Cunningham number, because it is equal to 930²-1.

It is not a de Polignac number, because 864899 - 2⁴ = 864883 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (864299) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467 + ... + 1395.

It is an arithmetic number, because the mean of its divisors is an integer number (88350).

2⁸⁶⁴⁸⁹⁹ is an apocalyptic number.

864899 is a deficient number, since it is larger than the sum of its proper divisors (195301).

864899 is a wasteful number, since it uses less digits than its factorization.

864899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962 (or 955 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 864899 is about 929.9994623654. Note that the first 3 decimals coincide. The cubic root of 864899 is about 95.2770857771.

The spelling of 864899 in words is "eight hundred sixty-four thousand, eight hundred ninety-nine".