639534542 has 8 divisors (see below), whose sum is σ = 959558832. Its totient is φ = 319681600.

The previous prime is 639534521. The next prime is 639534569. The reversal of 639534542 is 245435936.

639534542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×639534542² = 818008860822299528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639534542.

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, 33059 + ... + 48702.

It is an arithmetic number, because the mean of its divisors is an integer number (119944854).

Almost surely, 2^639534542 is an apocalyptic number.

639534542 is a deficient number, since it is larger than the sum of its proper divisors (320024290).

639534542 is a wasteful number, since it uses less digits than its factorization.

639534542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85674.

The product of its digits is 388800, while the sum is 41.

The square root of 639534542 is about 25289.0201866344. The cubic root of 639534542 is about 861.5649089159.

The spelling of 639534542 in words is "six hundred thirty-nine million, five hundred thirty-four thousand, five hundred forty-two".