639106 has 16 divisors (see below), whose sum is σ = 1056384. Its totient is φ = 288144.

The previous prime is 639091. The next prime is 639137. The reversal of 639106 is 601936.

It is an Ulam number.

It is an unprimeable number.

639106 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961 + ... + 1483.

It is an arithmetic number, because the mean of its divisors is an integer number (66024).

2⁶³⁹¹⁰⁶ is an apocalyptic number.

639106 is a deficient number, since it is larger than the sum of its proper divisors (417278).

639106 is a wasteful number, since it uses less digits than its factorization.

639106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 639106 is about 799.4410547376. The cubic root of 639106 is about 86.1372425568.

The spelling of 639106 in words is "six hundred thirty-nine thousand, one hundred six".