800947643 has 4 divisors (see below), whose sum is σ = 801459048. Its totient is φ = 800436240.

The previous prime is 800947591. The next prime is 800947649. The reversal of 800947643 is 346749008.

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 800947643 - 2⁸ = 800947387 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 800947643.

It is not an unprimeable number, because it can be changed into a prime (800947649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253346 + ... + 256487.

It is an arithmetic number, because the mean of its divisors is an integer number (200364762).

Almost surely, 2^800947643 is an apocalyptic number.

800947643 is a deficient number, since it is larger than the sum of its proper divisors (511405).

800947643 is a wasteful number, since it uses less digits than its factorization.

800947643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511404.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 800947643 is about 28301.0184092375. The cubic root of 800947643 is about 928.6841695166.

The spelling of 800947643 in words is "eight hundred million, nine hundred forty-seven thousand, six hundred forty-three".