639259340 has 24 divisors (see below), whose sum is σ = 1343079360. Its totient is φ = 255582848.

The previous prime is 639259333. The next prime is 639259343. The reversal of 639259340 is 43952936.

It is not an unprimeable number, because it can be changed into a prime (639259343) 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, 44576 + ... + 57144.

It is an arithmetic number, because the mean of its divisors is an integer number (55961640).

Almost surely, 2^639259340 is an apocalyptic number.

It is an amenable number.

639259340 is an abundant number, since it is smaller than the sum of its proper divisors (703820020).

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

639259340 is a wasteful number, since it uses less digits than its factorization.

639259340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15121 (or 15119 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 639259340 is about 25283.5784650828. The cubic root of 639259340 is about 861.4413094392.

The spelling of 639259340 in words is "six hundred thirty-nine million, two hundred fifty-nine thousand, three hundred forty".