638914459 has 8 divisors (see below), whose sum is σ = 651778400. Its totient is φ = 626178816.

The previous prime is 638914429. The next prime is 638914517. The reversal of 638914459 is 954419836.

It is a happy number.

638914459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638914459 - 2²⁵ = 605360027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638914429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21984 + ... + 41965.

It is an arithmetic number, because the mean of its divisors is an integer number (81472300).

Almost surely, 2^638914459 is an apocalyptic number.

638914459 is a deficient number, since it is larger than the sum of its proper divisors (12863941).

638914459 is a wasteful number, since it uses less digits than its factorization.

638914459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64149.

The product of its digits is 933120, while the sum is 49.

The square root of 638914459 is about 25276.7572880700. The cubic root of 638914459 is about 861.2863654464.

The spelling of 638914459 in words is "six hundred thirty-eight million, nine hundred fourteen thousand, four hundred fifty-nine".