638889559 has 12 divisors (see below), whose sum is σ = 802573072. Its totient is φ = 497835360.

The previous prime is 638889541. The next prime is 638889599. The reversal of 638889559 is 955988836.

638889559 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 638889559 - 2¹⁹ = 638365271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638889497 and 638889506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638889599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376302 + ... + 377995.

Almost surely, 2^638889559 is an apocalyptic number.

638889559 is a deficient number, since it is larger than the sum of its proper divisors (163683513).

638889559 is a wasteful number, since it uses less digits than its factorization.

638889559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754326 (or 754315 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 61.

The square root of 638889559 is about 25276.2647359138. The cubic root of 638889559 is about 861.2751765155.

The spelling of 638889559 in words is "six hundred thirty-eight million, eight hundred eighty-nine thousand, five hundred fifty-nine".