639505934 has 8 divisors (see below), whose sum is σ = 959749560. Its totient is φ = 319589416.

The previous prime is 639505907. The next prime is 639505939. The reversal of 639505934 is 439505936.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639505939) by changing a digit.

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, 76829 + ... + 84744.

It is an arithmetic number, because the mean of its divisors is an integer number (119968695).

Almost surely, 2^639505934 is an apocalyptic number.

639505934 is a deficient number, since it is larger than the sum of its proper divisors (320243626).

639505934 is a wasteful number, since it uses less digits than its factorization.

639505934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163554.

The product of its (nonzero) digits is 437400, while the sum is 44.

The square root of 639505934 is about 25288.4545593439. The cubic root of 639505934 is about 861.5520620641.

The spelling of 639505934 in words is "six hundred thirty-nine million, five hundred five thousand, nine hundred thirty-four".