805438247 has 2 divisors, whose sum is σ = 805438248. Its totient is φ = 805438246.

The previous prime is 805438241. The next prime is 805438301. The reversal of 805438247 is 742834508.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 805438247 - 2¹⁸ = 805176103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805438241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402719123 + 402719124.

It is an arithmetic number, because the mean of its divisors is an integer number (402719124).

Almost surely, 2^805438247 is an apocalyptic number.

805438247 is a deficient number, since it is larger than the sum of its proper divisors (1).

805438247 is an equidigital number, since it uses as much as digits as its factorization.

805438247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 41.

The square root of 805438247 is about 28380.2439559635. The cubic root of 805438247 is about 930.4165271042.

The spelling of 805438247 in words is "eight hundred five million, four hundred thirty-eight thousand, two hundred forty-seven".