639641222 has 8 divisors (see below), whose sum is σ = 1046685672. Its totient is φ = 290746000.

The previous prime is 639641209. The next prime is 639641231. The reversal of 639641222 is 222146936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 14537279 + ... + 14537322.

It is an arithmetic number, because the mean of its divisors is an integer number (130835709).

Almost surely, 2^639641222 is an apocalyptic number.

639641222 is a deficient number, since it is larger than the sum of its proper divisors (407044450).

639641222 is a wasteful number, since it uses less digits than its factorization.

639641222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29074614.

The product of its digits is 31104, while the sum is 35.

The square root of 639641222 is about 25291.1293144454. The cubic root of 639641222 is about 861.6128117934.

The spelling of 639641222 in words is "six hundred thirty-nine million, six hundred forty-one thousand, two hundred twenty-two".