805076639 has 2 divisors, whose sum is σ = 805076640. Its totient is φ = 805076638.

The previous prime is 805076621. The next prime is 805076641. The reversal of 805076639 is 936670508.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 805076639 - 2²⁰ = 804028063 is a prime.

Together with 805076641, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 805076639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805076609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402538319 + 402538320.

It is an arithmetic number, because the mean of its divisors is an integer number (402538320).

Almost surely, 2^805076639 is an apocalyptic number.

805076639 is a deficient number, since it is larger than the sum of its proper divisors (1).

805076639 is an equidigital number, since it uses as much as digits as its factorization.

805076639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 805076639 is about 28373.8724709899. The cubic root of 805076639 is about 930.2772669257.

The spelling of 805076639 in words is "eight hundred five million, seventy-six thousand, six hundred thirty-nine".