865479 has 4 divisors (see below), whose sum is σ = 1153976. Its totient is φ = 576984.

The previous prime is 865477. The next prime is 865481. The reversal of 865479 is 974568.

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

It is an interprime number because it is at equal distance from previous prime (865477) and next prime (865481).

It is not a de Polignac number, because 865479 - 2¹ = 865477 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865477) 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 3 ways as a sum of consecutive naturals, for example, 144244 + ... + 144249.

It is an arithmetic number, because the mean of its divisors is an integer number (288494).

2⁸⁶⁵⁴⁷⁹ is an apocalyptic number.

865479 is a deficient number, since it is larger than the sum of its proper divisors (288497).

865479 is a wasteful number, since it uses less digits than its factorization.

865479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288496.

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

The square root of 865479 is about 930.3112382423. The cubic root of 865479 is about 95.2983785762.

It can be divided in two parts, 86 and 5479, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 865479 in words is "eight hundred sixty-five thousand, four hundred seventy-nine".