639043852 has 12 divisors (see below), whose sum is σ = 1130892840. Its totient is φ = 315931616.

The previous prime is 639043837. The next prime is 639043861. The reversal of 639043852 is 258340936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897178 + ... + 897889.

It is an arithmetic number, because the mean of its divisors is an integer number (94241070).

Almost surely, 2^639043852 is an apocalyptic number.

It is an amenable number.

639043852 is a deficient number, since it is larger than the sum of its proper divisors (491848988).

639043852 is a wasteful number, since it uses less digits than its factorization.

639043852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795160 (or 1795158 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 639043852 is about 25279.3166838030. The cubic root of 639043852 is about 861.3445041130.

The spelling of 639043852 in words is "six hundred thirty-nine million, forty-three thousand, eight hundred fifty-two".