800643389 has 12 divisors (see below), whose sum is σ = 1003004604. Its totient is φ = 633475584.

The previous prime is 800643383. The next prime is 800643391. The reversal of 800643389 is 983346008.

It can be written as a sum of positive squares in 2 ways, for example, as 543682489 + 256960900 = 23317^2 + 16030^2 .

It is not a de Polignac number, because 800643389 - 2²⁴ = 783866173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800643383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 627812 + ... + 629085.

It is an arithmetic number, because the mean of its divisors is an integer number (83583717).

Almost surely, 2^800643389 is an apocalyptic number.

It is an amenable number.

800643389 is a deficient number, since it is larger than the sum of its proper divisors (202361215).

800643389 is a wasteful number, since it uses less digits than its factorization.

800643389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256924 (or 1256917 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 800643389 is about 28295.6425797330. The cubic root of 800643389 is about 928.5665623042.

The spelling of 800643389 in words is "eight hundred million, six hundred forty-three thousand, three hundred eighty-nine".