639096505 has 16 divisors (see below), whose sum is σ = 773121024. Its totient is φ = 507157120.

The previous prime is 639096499. The next prime is 639096509. The reversal of 639096505 is 505690936.

It is a happy number.

It is not a de Polignac number, because 639096505 - 2⁹ = 639095993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639096509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445269 + ... + 446701.

It is an arithmetic number, because the mean of its divisors is an integer number (48320064).

Almost surely, 2^639096505 is an apocalyptic number.

It is an amenable number.

639096505 is a deficient number, since it is larger than the sum of its proper divisors (134024519).

639096505 is a wasteful number, since it uses less digits than its factorization.

639096505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096.

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 639096505 is about 25280.3580868626. The cubic root of 639096505 is about 861.3681598327.

The spelling of 639096505 in words is "six hundred thirty-nine million, ninety-six thousand, five hundred five".