856903 has 2 divisors, whose sum is σ = 856904. Its totient is φ = 856902.

The previous prime is 856901. The next prime is 856909. The reversal of 856903 is 309658.

856903 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856903 - 2¹ = 856901 is a prime.

Together with 856901, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428451 + 428452.

It is an arithmetic number, because the mean of its divisors is an integer number (428452).

2⁸⁵⁶⁹⁰³ is an apocalyptic number.

856903 is a deficient number, since it is larger than the sum of its proper divisors (1).

856903 is an equidigital number, since it uses as much as digits as its factorization.

856903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 856903 is about 925.6905530468. The cubic root of 856903 is about 94.9825637436.

The spelling of 856903 in words is "eight hundred fifty-six thousand, nine hundred three".