856369 has 2 divisors, whose sum is σ = 856370. Its totient is φ = 856368.

The previous prime is 856351. The next prime is 856381. The reversal of 856369 is 963658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 471969 + 384400 = 687^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 856369 - 2⁷ = 856241 is a prime.

It is a super-2 number, since 2×856369² = 1466735728322, which contains 22 as substring.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (856309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428184 + 428185.

It is an arithmetic number, because the mean of its divisors is an integer number (428185).

2⁸⁵⁶³⁶⁹ is an apocalyptic number.

It is an amenable number.

856369 is a deficient number, since it is larger than the sum of its proper divisors (1).

856369 is an equidigital number, since it uses as much as digits as its factorization.

856369 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 856369 is about 925.4020747761. The cubic root of 856369 is about 94.9628294102.

It can be divided in two parts, 856 and 369, that added together give a triangular number (1225 = T₄₉).

The spelling of 856369 in words is "eight hundred fifty-six thousand, three hundred sixty-nine".