638395333 has 2 divisors, whose sum is σ = 638395334. Its totient is φ = 638395332.

The previous prime is 638395327. The next prime is 638395361. The reversal of 638395333 is 333593836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489604129 + 148791204 = 22127^2 + 12198^2 .

It is a cyclic number.

It is not a de Polignac number, because 638395333 - 2⁵ = 638395301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638395333.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638395633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319197666 + 319197667.

It is an arithmetic number, because the mean of its divisors is an integer number (319197667).

Almost surely, 2^638395333 is an apocalyptic number.

It is an amenable number.

638395333 is a deficient number, since it is larger than the sum of its proper divisors (1).

638395333 is an equidigital number, since it uses as much as digits as its factorization.

638395333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 43.

The square root of 638395333 is about 25266.4863603945. The cubic root of 638395333 is about 861.0530335869.

The spelling of 638395333 in words is "six hundred thirty-eight million, three hundred ninety-five thousand, three hundred thirty-three".