845823643 has 12 divisors (see below), whose sum is σ = 1026697680. Its totient is φ = 693469392.

The previous prime is 845823619. The next prime is 845823647. The reversal of 845823643 is 346328548.

It is not a de Polignac number, because 845823643 - 2¹⁷ = 845692571 is a prime.

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 845823643.

It is not an unprimeable number, because it can be changed into a prime (845823647) 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 11 ways as a sum of consecutive naturals, for example, 374128 + ... + 376381.

It is an arithmetic number, because the mean of its divisors is an integer number (85558140).

Almost surely, 2^845823643 is an apocalyptic number.

845823643 is a deficient number, since it is larger than the sum of its proper divisors (180874037).

845823643 is a wasteful number, since it uses less digits than its factorization.

845823643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750546 (or 750539 counting only the distinct ones).

The product of its digits is 552960, while the sum is 43.

The square root of 845823643 is about 29083.0473472090. The cubic root of 845823643 is about 945.7142656657.

The spelling of 845823643 in words is "eight hundred forty-five million, eight hundred twenty-three thousand, six hundred forty-three".