639346242 has 16 divisors (see below), whose sum is σ = 1283214240. Its totient is φ = 212361792.

The previous prime is 639346241. The next prime is 639346259. The reversal of 639346242 is 242643936.

It is a self number, because there is not a number n which added to its sum of digits gives 639346242.

It is not an unprimeable number, because it can be changed into a prime (639346241) 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 7 ways as a sum of consecutive naturals, for example, 186567 + ... + 189962.

It is an arithmetic number, because the mean of its divisors is an integer number (80200890).

Almost surely, 2^639346242 is an apocalyptic number.

639346242 is an abundant number, since it is smaller than the sum of its proper divisors (643867998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639346242 is a wasteful number, since it uses less digits than its factorization.

639346242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376817.

The product of its digits is 186624, while the sum is 39.

The square root of 639346242 is about 25285.2969529725. The cubic root of 639346242 is about 861.4803429352.

The spelling of 639346242 in words is "six hundred thirty-nine million, three hundred forty-six thousand, two hundred forty-two".