806345209 has 4 divisors (see below), whose sum is σ = 806406480. Its totient is φ = 806283940.

The previous prime is 806345191. The next prime is 806345213. The reversal of 806345209 is 902543608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 806345209 - 2¹³ = 806337017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806345219) 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 3 ways as a sum of consecutive naturals, for example, 1927 + ... + 40204.

It is an arithmetic number, because the mean of its divisors is an integer number (201601620).

Almost surely, 2^806345209 is an apocalyptic number.

It is an amenable number.

806345209 is a deficient number, since it is larger than the sum of its proper divisors (61271).

806345209 is a wasteful number, since it uses less digits than its factorization.

806345209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61270.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 806345209 is about 28396.2182165161. The cubic root of 806345209 is about 930.7656272766.

The spelling of 806345209 in words is "eight hundred six million, three hundred forty-five thousand, two hundred nine".