639516142 has 16 divisors (see below), whose sum is σ = 965457792. Its totient is φ = 317704120.

The previous prime is 639516121. The next prime is 639516161. The reversal of 639516142 is 241615936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214353 + ... + 217315.

It is an arithmetic number, because the mean of its divisors is an integer number (60341112).

Almost surely, 2^639516142 is an apocalyptic number.

639516142 is a deficient number, since it is larger than the sum of its proper divisors (325941650).

639516142 is a wasteful number, since it uses less digits than its factorization.

639516142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623.

The product of its digits is 38880, while the sum is 37.

The square root of 639516142 is about 25288.6563897729. The cubic root of 639516142 is about 861.5566461637.

The spelling of 639516142 in words is "six hundred thirty-nine million, five hundred sixteen thousand, one hundred forty-two".