82779839 has 2 divisors, whose sum is σ = 82779840. Its totient is φ = 82779838.

The previous prime is 82779811. The next prime is 82779847. The reversal of 82779839 is 93897728.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82779839 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82779869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41389919 + 41389920.

It is an arithmetic number, because the mean of its divisors is an integer number (41389920).

Almost surely, 2^82779839 is an apocalyptic number.

82779839 is a deficient number, since it is larger than the sum of its proper divisors (1).

82779839 is an equidigital number, since it uses as much as digits as its factorization.

82779839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 82779839 is about 9098.3426512745. The cubic root of 82779839 is about 435.8210397461.

The spelling of 82779839 in words is "eighty-two million, seven hundred seventy-nine thousand, eight hundred thirty-nine".