639827242 has 8 divisors (see below), whose sum is σ = 1010253600. Its totient is φ = 303076044.

The previous prime is 639827239. The next prime is 639827297. The reversal of 639827242 is 242728936.

639827242 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8418742 + ... + 8418817.

It is an arithmetic number, because the mean of its divisors is an integer number (126281700).

Almost surely, 2^639827242 is an apocalyptic number.

639827242 is a deficient number, since it is larger than the sum of its proper divisors (370426358).

639827242 is a wasteful number, since it uses less digits than its factorization.

639827242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16837580.

The product of its digits is 290304, while the sum is 43.

The square root of 639827242 is about 25294.8066211228. The cubic root of 639827242 is about 861.6963282372.

The spelling of 639827242 in words is "six hundred thirty-nine million, eight hundred twenty-seven thousand, two hundred forty-two".