865344217 has 8 divisors (see below), whose sum is σ = 919657800. Its totient is φ = 811409664.

The previous prime is 865344191. The next prime is 865344229. The reversal of 865344217 is 712443568.

865344217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 329930896 + 535413321 = 18164^2 + 23139^2 .

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 865344217 - 2²⁷ = 731126489 is a prime.

It is a super-2 number, since 2×865344217² = 1497641227790686178, which contains 22 as substring.

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 865344217.

It is not an unprimeable number, because it can be changed into a prime (865344317) 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, 90042 + ... + 99187.

It is an arithmetic number, because the mean of its divisors is an integer number (114957225).

Almost surely, 2^865344217 is an apocalyptic number.

It is an amenable number.

865344217 is a deficient number, since it is larger than the sum of its proper divisors (54313583).

865344217 is a wasteful number, since it uses less digits than its factorization.

865344217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189515.

The product of its digits is 161280, while the sum is 40.

The square root of 865344217 is about 29416.7336222090. The cubic root of 865344217 is about 952.9343130874.

The spelling of 865344217 in words is "eight hundred sixty-five million, three hundred forty-four thousand, two hundred seventeen".