638041043 has 2 divisors, whose sum is σ = 638041044. Its totient is φ = 638041042.

The previous prime is 638041021. The next prime is 638041073. The reversal of 638041043 is 340140836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638041043 - 2⁶ = 638040979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638040997 and 638041015.

It is not a weakly prime, because it can be changed into another prime (638041073) 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, 319020521 + 319020522.

It is an arithmetic number, because the mean of its divisors is an integer number (319020522).

Almost surely, 2^638041043 is an apocalyptic number.

638041043 is a deficient number, since it is larger than the sum of its proper divisors (1).

638041043 is an equidigital number, since it uses as much as digits as its factorization.

638041043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 638041043 is about 25259.4743215293. The cubic root of 638041043 is about 860.8937180268.

Adding to 638041043 its reverse (340140836), we get a palindrome (978181879).

The spelling of 638041043 in words is "six hundred thirty-eight million, forty-one thousand, forty-three".