866863243 has 4 divisors (see below), whose sum is σ = 869926648. Its totient is φ = 863799840.

The previous prime is 866863189. The next prime is 866863259. The reversal of 866863243 is 342368668.

866863243 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 is a cyclic number.

It is not a de Polignac number, because 866863243 - 2¹³ = 866855051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866863193 and 866863202.

It is not an unprimeable number, because it can be changed into a prime (866863043) 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, 1531278 + ... + 1531843.

It is an arithmetic number, because the mean of its divisors is an integer number (217481662).

Almost surely, 2^866863243 is an apocalyptic number.

866863243 is a deficient number, since it is larger than the sum of its proper divisors (3063405).

866863243 is a wasteful number, since it uses less digits than its factorization.

866863243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063404.

The product of its digits is 995328, while the sum is 46.

The square root of 866863243 is about 29442.5413814772. The cubic root of 866863243 is about 953.4915810488.

The spelling of 866863243 in words is "eight hundred sixty-six million, eight hundred sixty-three thousand, two hundred forty-three".