856693 has 2 divisors, whose sum is σ = 856694. Its totient is φ = 856692.

The previous prime is 856649. The next prime is 856697. The reversal of 856693 is 396658.

856693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 702244 + 154449 = 838^2 + 393^2 .

It is a cyclic number.

It is not a de Polignac number, because 856693 - 2⁹ = 856181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856697) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428346 + 428347.

It is an arithmetic number, because the mean of its divisors is an integer number (428347).

2⁸⁵⁶⁶⁹³ is an apocalyptic number.

It is an amenable number.

856693 is a deficient number, since it is larger than the sum of its proper divisors (1).

856693 is an equidigital number, since it uses as much as digits as its factorization.

856693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 856693 is about 925.5771172625. The cubic root of 856693 is about 94.9748040291.

The spelling of 856693 in words is "eight hundred fifty-six thousand, six hundred ninety-three".