639106434 has 24 divisors (see below), whose sum is σ = 1405400880. Its totient is φ = 209855448.

The previous prime is 639106421. The next prime is 639106441. The reversal of 639106434 is 434601936.

639106434 is a `hidden beast` number, since 6 + 3 + 9 + 1 + 0 + 643 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263764 + ... + 266175.

It is an arithmetic number, because the mean of its divisors is an integer number (58558370).

Almost surely, 2^639106434 is an apocalyptic number.

639106434 is an abundant number, since it is smaller than the sum of its proper divisors (766294446).

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

639106434 is a wasteful number, since it uses less digits than its factorization.

639106434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530014 (or 530011 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 639106434 is about 25280.5544638562. The cubic root of 639106434 is about 861.3726205467.

The spelling of 639106434 in words is "six hundred thirty-nine million, one hundred six thousand, four hundred thirty-four".