856013 has 4 divisors (see below), whose sum is σ = 870108. Its totient is φ = 841920.

The previous prime is 855997. The next prime is 856021. The reversal of 856013 is 310658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58564 + 797449 = 242^2 + 893^2 .

It is a cyclic number.

It is not a de Polignac number, because 856013 - 2⁴ = 855997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6956 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (217527).

2⁸⁵⁶⁰¹³ is an apocalyptic number.

It is an amenable number.

856013 is a deficient number, since it is larger than the sum of its proper divisors (14095).

856013 is a wasteful number, since it uses less digits than its factorization.

856013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14094.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 856013 is about 925.2097059586. The cubic root of 856013 is about 94.9496686298.

The spelling of 856013 in words is "eight hundred fifty-six thousand, thirteen".