638869203 has 18 divisors (see below), whose sum is σ = 1073474844. Its totient is φ = 365067864.

The previous prime is 638869193. The next prime is 638869211. The reversal of 638869203 is 302968836.

638869203 is a `hidden beast` number, since 6 + 388 + 69 + 203 = 666.

638869203 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638869203 - 2¹³ = 638861011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638869403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 723901 + ... + 724782.

Almost surely, 2^638869203 is an apocalyptic number.

638869203 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

638869203 is a deficient number, since it is larger than the sum of its proper divisors (434605641).

638869203 is a wasteful number, since it uses less digits than its factorization.

638869203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448703 (or 1448693 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 638869203 is about 25275.8620624500. The cubic root of 638869203 is about 861.2660292362.

The spelling of 638869203 in words is "six hundred thirty-eight million, eight hundred sixty-nine thousand, two hundred three".