856441 has 2 divisors, whose sum is σ = 856442. Its totient is φ = 856440.

The previous prime is 856421. The next prime is 856459. The reversal of 856441 is 144658.

856441 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., 672400 + 184041 = 820^2 + 429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856441 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428220 + 428221.

It is an arithmetic number, because the mean of its divisors is an integer number (428221).

2⁸⁵⁶⁴⁴¹ is an apocalyptic number.

It is an amenable number.

856441 is a deficient number, since it is larger than the sum of its proper divisors (1).

856441 is an equidigital number, since it uses as much as digits as its factorization.

856441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 856441 is about 925.4409759677. The cubic root of 856441 is about 94.9654906976.

The spelling of 856441 in words is "eight hundred fifty-six thousand, four hundred forty-one".