856479 has 8 divisors (see below), whose sum is σ = 1229872. Its totient is φ = 527040.

The previous prime is 856469. The next prime is 856483. The reversal of 856479 is 974658.

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

It is not a de Polignac number, because 856479 - 2⁷ = 856351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 21961 = 856479 / (8 + 5 + 6 + 4 + 7 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10942 + ... + 11019.

It is an arithmetic number, because the mean of its divisors is an integer number (153734).

2⁸⁵⁶⁴⁷⁹ is an apocalyptic number.

856479 is a deficient number, since it is larger than the sum of its proper divisors (373393).

856479 is a wasteful number, since it uses less digits than its factorization.

856479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21977.

The product of its digits is 60480, while the sum is 39.

The square root of 856479 is about 925.4615064928. The cubic root of 856479 is about 94.9668952058.

The spelling of 856479 in words is "eight hundred fifty-six thousand, four hundred seventy-nine".