639065042 has 32 divisors (see below), whose sum is σ = 1198679040. Its totient is φ = 248248080.

The previous prime is 639065027. The next prime is 639065087. The reversal of 639065042 is 240560936.

It is a junction number, because it is equal to n+sod(n) for n = 639064993 and 639065011.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47459 + ... + 59417.

It is an arithmetic number, because the mean of its divisors is an integer number (37458720).

Almost surely, 2^639065042 is an apocalyptic number.

639065042 is a deficient number, since it is larger than the sum of its proper divisors (559613998).

639065042 is a wasteful number, since it uses less digits than its factorization.

639065042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12326.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 639065042 is about 25279.7357976700. The cubic root of 639065042 is about 861.3540244238.

The spelling of 639065042 in words is "six hundred thirty-nine million, sixty-five thousand, forty-two".