866843247 has 4 divisors (see below), whose sum is σ = 1155791000. Its totient is φ = 577895496.

The previous prime is 866843183. The next prime is 866843261. The reversal of 866843247 is 742348668.

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

It is not a de Polignac number, because 866843247 - 2⁶ = 866843183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866843196 and 866843205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866843287) 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, 144473872 + ... + 144473877.

It is an arithmetic number, because the mean of its divisors is an integer number (288947750).

Almost surely, 2^866843247 is an apocalyptic number.

866843247 is a deficient number, since it is larger than the sum of its proper divisors (288947753).

866843247 is a wasteful number, since it uses less digits than its factorization.

866843247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288947752.

The product of its digits is 1548288, while the sum is 48.

The square root of 866843247 is about 29442.2018028544. The cubic root of 866843247 is about 953.4842495717.

It can be divided in two parts, 8668 and 43247, that added together give a palindrome (51915).

The spelling of 866843247 in words is "eight hundred sixty-six million, eight hundred forty-three thousand, two hundred forty-seven".