705779 has 2 divisors, whose sum is σ = 705780. Its totient is φ = 705778.

The previous prime is 705769. The next prime is 705781. The reversal of 705779 is 977507.

It is a strong prime.

It is an emirp because it is prime and its reverse (977507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 705779 - 2⁴ = 705763 is a prime.

It is a Sophie Germain prime.

Together with 705781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (705769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352889 + 352890.

It is an arithmetic number, because the mean of its divisors is an integer number (352890).

2⁷⁰⁵⁷⁷⁹ is an apocalyptic number.

705779 is a deficient number, since it is larger than the sum of its proper divisors (1).

705779 is an equidigital number, since it uses as much as digits as its factorization.

705779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15435, while the sum is 35.

The square root of 705779 is about 840.1065408625. The cubic root of 705779 is about 89.0340735585.

The spelling of 705779 in words is "seven hundred five thousand, seven hundred seventy-nine".