856849 has 8 divisors (see below), whose sum is σ = 989120. Its totient is φ = 727056.

The previous prime is 856847. The next prime is 856853. The reversal of 856849 is 948658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856849 - 2¹ = 856847 is a prime.

It is a Duffinian number.

856849 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202 + ... + 1324.

It is an arithmetic number, because the mean of its divisors is an integer number (123640).

2⁸⁵⁶⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

856849 is a deficient number, since it is larger than the sum of its proper divisors (132271).

856849 is a wasteful number, since it uses less digits than its factorization.

856849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239.

The product of its digits is 69120, while the sum is 40.

The square root of 856849 is about 925.6613851728. The cubic root of 856849 is about 94.9805685096.

Subtracting 856849 from its reverse (948658), we obtain a square (91809 = 303²).

The spelling of 856849 in words is "eight hundred fifty-six thousand, eight hundred forty-nine".