638489059 has 4 divisors (see below), whose sum is σ = 687603616. Its totient is φ = 589374504.

The previous prime is 638489041. The next prime is 638489087. The reversal of 638489059 is 950984836.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638489059 - 2⁷ = 638488931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638488997 and 638489015.

It is not an unprimeable number, because it can be changed into a prime (638489359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24557259 + ... + 24557284.

It is an arithmetic number, because the mean of its divisors is an integer number (171900904).

Almost surely, 2^638489059 is an apocalyptic number.

638489059 is a deficient number, since it is larger than the sum of its proper divisors (49114557).

638489059 is a wasteful number, since it uses less digits than its factorization.

638489059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49114556.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 638489059 is about 25268.3410417067. The cubic root of 638489059 is about 861.0951700204.

The spelling of 638489059 in words is "six hundred thirty-eight million, four hundred eighty-nine thousand, fifty-nine".