639506212 has 12 divisors (see below), whose sum is σ = 1126647900. Its totient is φ = 317606816.

The previous prime is 639506183. The next prime is 639506227. The reversal of 639506212 is 212605936.

It can be written as a sum of positive squares in 2 ways, for example, as 32080896 + 607425316 = 5664^2 + 24646^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535903 + ... + 537094.

It is an arithmetic number, because the mean of its divisors is an integer number (93887325).

Almost surely, 2^639506212 is an apocalyptic number.

It is an amenable number.

639506212 is a deficient number, since it is larger than the sum of its proper divisors (487141688).

639506212 is a wasteful number, since it uses less digits than its factorization.

639506212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073150 (or 1073148 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 639506212 is about 25288.4600559227. The cubic root of 639506212 is about 861.5521869060.

The spelling of 639506212 in words is "six hundred thirty-nine million, five hundred six thousand, two hundred twelve".