809837243 has 4 divisors (see below), whose sum is σ = 814995600. Its totient is φ = 804678888.

The previous prime is 809837221. The next prime is 809837251. The reversal of 809837243 is 342738908.

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 809837243 - 2²⁴ = 793060027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809837194 and 809837203.

It is not an unprimeable number, because it can be changed into a prime (809837263) 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, 2578943 + ... + 2579256.

It is an arithmetic number, because the mean of its divisors is an integer number (203748900).

Almost surely, 2^809837243 is an apocalyptic number.

809837243 is a deficient number, since it is larger than the sum of its proper divisors (5158357).

809837243 is a wasteful number, since it uses less digits than its factorization.

809837243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158356.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 809837243 is about 28457.6394488369. The cubic root of 809837243 is about 932.1073125618.

The spelling of 809837243 in words is "eight hundred nine million, eight hundred thirty-seven thousand, two hundred forty-three".