856249 has 2 divisors, whose sum is σ = 856250. Its totient is φ = 856248.

The previous prime is 856241. The next prime is 856277. The reversal of 856249 is 942658.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692224 + 164025 = 832^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 856249 - 2³ = 856241 is a prime.

856249 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (856241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428124 + 428125.

It is an arithmetic number, because the mean of its divisors is an integer number (428125).

2⁸⁵⁶²⁴⁹ is an apocalyptic number.

It is an amenable number.

856249 is a deficient number, since it is larger than the sum of its proper divisors (1).

856249 is an equidigital number, since it uses as much as digits as its factorization.

856249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 856249 is about 925.3372358227. The cubic root of 856249 is about 94.9583935997.

The spelling of 856249 in words is "eight hundred fifty-six thousand, two hundred forty-nine".