864621443 has 4 divisors (see below), whose sum is σ = 988138800. Its totient is φ = 741104088.

The previous prime is 864621437. The next prime is 864621469. The reversal of 864621443 is 344126468.

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 864621443 - 2⁶ = 864621379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 864621397 and 864621406.

It is not an unprimeable number, because it can be changed into a prime (864621413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61758668 + ... + 61758681.

It is an arithmetic number, because the mean of its divisors is an integer number (247034700).

Almost surely, 2^864621443 is an apocalyptic number.

864621443 is a deficient number, since it is larger than the sum of its proper divisors (123517357).

864621443 is a wasteful number, since it uses less digits than its factorization.

864621443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123517356.

The product of its digits is 110592, while the sum is 38.

The square root of 864621443 is about 29404.4459733558. The cubic root of 864621443 is about 952.6689281378.

The spelling of 864621443 in words is "eight hundred sixty-four million, six hundred twenty-one thousand, four hundred forty-three".