640120339 has 2 divisors, whose sum is σ = 640120340. Its totient is φ = 640120338.

The previous prime is 640120237. The next prime is 640120361. The reversal of 640120339 is 933021046.

640120339 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640120339 - 2¹⁵ = 640087571 is a prime.

It is not a weakly prime, because it can be changed into another prime (640120399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320060169 + 320060170.

It is an arithmetic number, because the mean of its divisors is an integer number (320060170).

Almost surely, 2^640120339 is an apocalyptic number.

640120339 is a deficient number, since it is larger than the sum of its proper divisors (1).

640120339 is an equidigital number, since it uses as much as digits as its factorization.

640120339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 640120339 is about 25300.5995778756. The cubic root of 640120339 is about 861.8278856520.

The spelling of 640120339 in words is "six hundred forty million, one hundred twenty thousand, three hundred thirty-nine".