638489963 has 2 divisors, whose sum is σ = 638489964. Its totient is φ = 638489962.

The previous prime is 638489953. The next prime is 638489977. The reversal of 638489963 is 369984836.

638489963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638489963 - 2⁶ = 638489899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638489899 and 638489908.

It is not a weakly prime, because it can be changed into another prime (638489903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319244981 + 319244982.

It is an arithmetic number, because the mean of its divisors is an integer number (319244982).

Almost surely, 2^638489963 is an apocalyptic number.

638489963 is a deficient number, since it is larger than the sum of its proper divisors (1).

638489963 is an equidigital number, since it uses as much as digits as its factorization.

638489963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 56.

The square root of 638489963 is about 25268.3589296970. The cubic root of 638489963 is about 861.0955764119.

The spelling of 638489963 in words is "six hundred thirty-eight million, four hundred eighty-nine thousand, nine hundred sixty-three".