639844234 has 8 divisors (see below), whose sum is σ = 961029828. Its totient is φ = 319500960.

The previous prime is 639844213. The next prime is 639844267. The reversal of 639844234 is 432448936.

639844234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 395015625 + 244828609 = 19875^2 + 15647^2 .

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, 208677 + ... + 211720.

Almost surely, 2^639844234 is an apocalyptic number.

639844234 is a deficient number, since it is larger than the sum of its proper divisors (321185594).

639844234 is a wasteful number, since it uses less digits than its factorization.

639844234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421160.

The product of its digits is 497664, while the sum is 43.

The square root of 639844234 is about 25295.1424981161. The cubic root of 639844234 is about 861.7039562413.

The spelling of 639844234 in words is "six hundred thirty-nine million, eight hundred forty-four thousand, two hundred thirty-four".