856699 has 2 divisors, whose sum is σ = 856700. Its totient is φ = 856698.

The previous prime is 856697. The next prime is 856703. The reversal of 856699 is 996658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856699 - 2¹ = 856697 is a prime.

Together with 856697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (856693) 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 as a sum of consecutive naturals, namely, 428349 + 428350.

It is an arithmetic number, because the mean of its divisors is an integer number (428350).

2⁸⁵⁶⁶⁹⁹ is an apocalyptic number.

856699 is a deficient number, since it is larger than the sum of its proper divisors (1).

856699 is an equidigital number, since it uses as much as digits as its factorization.

856699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 856699 is about 925.5803584779. The cubic root of 856699 is about 94.9750257528.

The spelling of 856699 in words is "eight hundred fifty-six thousand, six hundred ninety-nine".