868999 has 2 divisors, whose sum is σ = 869000. Its totient is φ = 868998.

The previous prime is 868997. The next prime is 869017. The reversal of 868999 is 999868.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 868999 - 2¹ = 868997 is a prime.

Together with 868997, it forms a pair of twin primes.

868999 is a modest number, since divided by 999 gives 868 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434499 + 434500.

It is an arithmetic number, because the mean of its divisors is an integer number (434500).

2⁸⁶⁸⁹⁹⁹ is an apocalyptic number.

868999 is a deficient number, since it is larger than the sum of its proper divisors (1).

868999 is an equidigital number, since it uses as much as digits as its factorization.

868999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 868999 is about 932.2011585489. The cubic root of 868999 is about 95.4274002108.

The spelling of 868999 in words is "eight hundred sixty-eight thousand, nine hundred ninety-nine".