639027079 has 2 divisors, whose sum is σ = 639027080. Its totient is φ = 639027078.

The previous prime is 639027071. The next prime is 639027097. The reversal of 639027079 is 970720936.

639027079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (639027097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639027079 - 2³ = 639027071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639027071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319513539 + 319513540.

It is an arithmetic number, because the mean of its divisors is an integer number (319513540).

Almost surely, 2^639027079 is an apocalyptic number.

639027079 is a deficient number, since it is larger than the sum of its proper divisors (1).

639027079 is an equidigital number, since it uses as much as digits as its factorization.

639027079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 639027079 is about 25278.9849281968. The cubic root of 639027079 is about 861.3369681368.

The spelling of 639027079 in words is "six hundred thirty-nine million, twenty-seven thousand, seventy-nine".