639823603 has 2 divisors, whose sum is σ = 639823604. Its totient is φ = 639823602.

The previous prime is 639823523. The next prime is 639823621. The reversal of 639823603 is 306328936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639823603 - 2⁹ = 639823091 is a prime.

It is not a weakly prime, because it can be changed into another prime (639823003) 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 as a sum of consecutive naturals, namely, 319911801 + 319911802.

It is an arithmetic number, because the mean of its divisors is an integer number (319911802).

Almost surely, 2^639823603 is an apocalyptic number.

639823603 is a deficient number, since it is larger than the sum of its proper divisors (1).

639823603 is an equidigital number, since it uses as much as digits as its factorization.

639823603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 639823603 is about 25294.7346892589. The cubic root of 639823603 is about 861.6946946093.

The spelling of 639823603 in words is "six hundred thirty-nine million, eight hundred twenty-three thousand, six hundred three".