809430247 has 2 divisors, whose sum is σ = 809430248. Its totient is φ = 809430246.

The previous prime is 809430239. The next prime is 809430253. The reversal of 809430247 is 742034908.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809430247 - 2³ = 809430239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809430217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404715123 + 404715124.

It is an arithmetic number, because the mean of its divisors is an integer number (404715124).

Almost surely, 2^809430247 is an apocalyptic number.

809430247 is a deficient number, since it is larger than the sum of its proper divisors (1).

809430247 is an equidigital number, since it uses as much as digits as its factorization.

809430247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 809430247 is about 28450.4876408121. The cubic root of 809430247 is about 931.9511381698.

It can be divided in two parts, 809 and 430247, that added together give a triangular number (431056 = T₉₂₈).

The spelling of 809430247 in words is "eight hundred nine million, four hundred thirty thousand, two hundred forty-seven".