809729243 has 4 divisors (see below), whose sum is σ = 809839248. Its totient is φ = 809619240.

The previous prime is 809729231. The next prime is 809729273. The reversal of 809729243 is 342927908.

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 809729243 - 2⁸ = 809728987 is a prime.

It is a super-2 number, since 2×809729243² = 1311322893938706098, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809729194 and 809729203.

It is not an unprimeable number, because it can be changed into a prime (809729273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43103 + ... + 58968.

It is an arithmetic number, because the mean of its divisors is an integer number (202459812).

Almost surely, 2^809729243 is an apocalyptic number.

809729243 is a deficient number, since it is larger than the sum of its proper divisors (110005).

809729243 is a wasteful number, since it uses less digits than its factorization.

809729243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110004.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 809729243 is about 28455.7418283200. The cubic root of 809729243 is about 932.0658754023.

The spelling of 809729243 in words is "eight hundred nine million, seven hundred twenty-nine thousand, two hundred forty-three".