638803873 has 2 divisors, whose sum is σ = 638803874. Its totient is φ = 638803872.

The previous prime is 638803861. The next prime is 638803877. The reversal of 638803873 is 378308836.

638803873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624150289 + 14653584 = 24983^2 + 3828^2 .

It is a cyclic number.

It is not a de Polignac number, because 638803873 - 2¹³ = 638795681 is a prime.

It is not a weakly prime, because it can be changed into another prime (638803877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319401936 + 319401937.

It is an arithmetic number, because the mean of its divisors is an integer number (319401937).

Almost surely, 2^638803873 is an apocalyptic number.

It is an amenable number.

638803873 is a deficient number, since it is larger than the sum of its proper divisors (1).

638803873 is an equidigital number, since it uses as much as digits as its factorization.

638803873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 638803873 is about 25274.5696897099. The cubic root of 638803873 is about 861.2366708911.

The spelling of 638803873 in words is "six hundred thirty-eight million, eight hundred three thousand, eight hundred seventy-three".