639310246 has 4 divisors (see below), whose sum is σ = 958965372. Its totient is φ = 319655122.

The previous prime is 639310223. The next prime is 639310247. The reversal of 639310246 is 642013936.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639310247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159827560 + ... + 159827563.

It is an arithmetic number, because the mean of its divisors is an integer number (239741343).

Almost surely, 2^639310246 is an apocalyptic number.

639310246 is a deficient number, since it is larger than the sum of its proper divisors (319655126).

639310246 is a wasteful number, since it uses less digits than its factorization.

639310246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319655125.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 639310246 is about 25284.5851458947. The cubic root of 639310246 is about 861.4641751551.

The spelling of 639310246 in words is "six hundred thirty-nine million, three hundred ten thousand, two hundred forty-six".