647703923 has 2 divisors, whose sum is σ = 647703924. Its totient is φ = 647703922.

The previous prime is 647703911. The next prime is 647703967. The reversal of 647703923 is 329307746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647703923 - 2¹⁰ = 647702899 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (647703223) 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, 323851961 + 323851962.

It is an arithmetic number, because the mean of its divisors is an integer number (323851962).

Almost surely, 2^647703923 is an apocalyptic number.

647703923 is a deficient number, since it is larger than the sum of its proper divisors (1).

647703923 is an equidigital number, since it uses as much as digits as its factorization.

647703923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 41.

The square root of 647703923 is about 25450.0279567626. The cubic root of 647703923 is about 865.2179267590.

The spelling of 647703923 in words is "six hundred forty-seven million, seven hundred three thousand, nine hundred twenty-three".