856799 has 2 divisors, whose sum is σ = 856800. Its totient is φ = 856798.

The previous prime is 856789. The next prime is 856811. The reversal of 856799 is 997658.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856799 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428399 + 428400.

It is an arithmetic number, because the mean of its divisors is an integer number (428400).

2⁸⁵⁶⁷⁹⁹ is an apocalyptic number.

856799 is a deficient number, since it is larger than the sum of its proper divisors (1).

856799 is an equidigital number, since it uses as much as digits as its factorization.

856799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 856799 is about 925.6343770626. The cubic root of 856799 is about 94.9787209959.

The spelling of 856799 in words is "eight hundred fifty-six thousand, seven hundred ninety-nine".