866043841 has 4 divisors (see below), whose sum is σ = 932662612. Its totient is φ = 799425072.

The previous prime is 866043799. The next prime is 866043847. The reversal of 866043841 is 148340668.

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 285474816 + 580569025 = 16896^2 + 24095^2 .

It is a cyclic number.

It is not a de Polignac number, because 866043841 - 2⁹ = 866043329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866043794 and 866043803.

It is not an unprimeable number, because it can be changed into a prime (866043847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33309366 + ... + 33309391.

It is an arithmetic number, because the mean of its divisors is an integer number (233165653).

Almost surely, 2^866043841 is an apocalyptic number.

It is an amenable number.

866043841 is a deficient number, since it is larger than the sum of its proper divisors (66618771).

866043841 is a wasteful number, since it uses less digits than its factorization.

866043841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66618770.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 866043841 is about 29428.6228186098. The cubic root of 866043841 is about 953.1910572094.

The spelling of 866043841 in words is "eight hundred sixty-six million, forty-three thousand, eight hundred forty-one".