856319 has 4 divisors (see below), whose sum is σ = 858696. Its totient is φ = 853944.

The previous prime is 856309. The next prime is 856333. The reversal of 856319 is 913658.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856319 is a prime.

It is a super-2 number, since 2×856319² = 1466564459522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856309) 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, 524 + ... + 1409.

It is an arithmetic number, because the mean of its divisors is an integer number (214674).

2⁸⁵⁶³¹⁹ is an apocalyptic number.

856319 is a deficient number, since it is larger than the sum of its proper divisors (2377).

856319 is a wasteful number, since it uses less digits than its factorization.

856319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376.

The product of its digits is 6480, while the sum is 32.

The square root of 856319 is about 925.3750590977. The cubic root of 856319 is about 94.9609812062.

The spelling of 856319 in words is "eight hundred fifty-six thousand, three hundred nineteen".