639842212 has 12 divisors (see below), whose sum is σ = 1120455756. Its totient is φ = 319712000.

The previous prime is 639842179. The next prime is 639842213. The reversal of 639842212 is 212248936.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47114496 + 592727716 = 6864^2 + 24346^2 .

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 3 ways as a sum of consecutive naturals, for example, 45289 + ... + 57712.

It is an arithmetic number, because the mean of its divisors is an integer number (93371313).

Almost surely, 2^639842212 is an apocalyptic number.

It is an amenable number.

639842212 is a deficient number, since it is larger than the sum of its proper divisors (480613544).

639842212 is a wasteful number, since it uses less digits than its factorization.

639842212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104558 (or 104556 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 639842212 is about 25295.1025299365. The cubic root of 639842212 is about 861.7030485374.

The spelling of 639842212 in words is "six hundred thirty-nine million, eight hundred forty-two thousand, two hundred twelve".