865800673 has 4 divisors (see below), whose sum is σ = 866217220. Its totient is φ = 865384128.

The previous prime is 865800671. The next prime is 865800679. The reversal of 865800673 is 376008568.

865800673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 440286289 + 425514384 = 20983^2 + 20628^2 .

It is a cyclic number.

It is not a de Polignac number, because 865800673 - 2¹ = 865800671 is a prime.

It is a super-2 number, since 2×865800673² = 1499221610734505858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865800671) 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, 205140 + ... + 209317.

It is an arithmetic number, because the mean of its divisors is an integer number (216554305).

Almost surely, 2^865800673 is an apocalyptic number.

It is an amenable number.

865800673 is a deficient number, since it is larger than the sum of its proper divisors (416547).

865800673 is a wasteful number, since it uses less digits than its factorization.

865800673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416546.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 865800673 is about 29424.4910406280. The cubic root of 865800673 is about 953.1018364529.

The spelling of 865800673 in words is "eight hundred sixty-five million, eight hundred thousand, six hundred seventy-three".