866219443 has 4 divisors (see below), whose sum is σ = 911809960. Its totient is φ = 820628928.

The previous prime is 866219429. The next prime is 866219507. The reversal of 866219443 is 344912668.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866219443 is a prime.

It is a super-2 number, since 2×866219443² = 1500672246862460498, 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 866219443.

It is not an unprimeable number, because it can be changed into a prime (866219743) 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, 22795230 + ... + 22795267.

It is an arithmetic number, because the mean of its divisors is an integer number (227952490).

Almost surely, 2^866219443 is an apocalyptic number.

866219443 is a deficient number, since it is larger than the sum of its proper divisors (45590517).

866219443 is a wasteful number, since it uses less digits than its factorization.

866219443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45590516.

The product of its digits is 248832, while the sum is 43.

The square root of 866219443 is about 29431.6061913039. The cubic root of 866219443 is about 953.2554769445.

The spelling of 866219443 in words is "eight hundred sixty-six million, two hundred nineteen thousand, four hundred forty-three".