639842211 has 12 divisors (see below), whose sum is σ = 925627560. Its totient is φ = 425910240.

The previous prime is 639842179. The next prime is 639842213. The reversal of 639842211 is 112248936.

639842211 is a `hidden beast` number, since 639 + 8 + 4 + 2 + 2 + 11 = 666.

639842211 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 639842211 - 2⁵ = 639842179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639842213) 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, 48010 + ... + 59871.

It is an arithmetic number, because the mean of its divisors is an integer number (77135630).

Almost surely, 2^639842211 is an apocalyptic number.

639842211 is a deficient number, since it is larger than the sum of its proper divisors (285785349).

639842211 is a wasteful number, since it uses less digits than its factorization.

639842211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108546 (or 108543 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 639842211 is about 25295.1025101698. The cubic root of 639842211 is about 861.7030480885.

The spelling of 639842211 in words is "six hundred thirty-nine million, eight hundred forty-two thousand, two hundred eleven".