639006 has 8 divisors (see below), whose sum is σ = 1278024. Its totient is φ = 213000.

The previous prime is 638999. The next prime is 639007. The reversal of 639006 is 600936.

It is a sphenic number, since it is the product of 3 distinct primes.

639006 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53245 + ... + 53256.

It is an arithmetic number, because the mean of its divisors is an integer number (159753).

2⁶³⁹⁰⁰⁶ is an apocalyptic number.

639006 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

639006 is a wasteful number, since it uses less digits than its factorization.

639006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106506.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 639006 is about 799.3785085928. The cubic root of 639006 is about 86.1327497322.

The spelling of 639006 in words is "six hundred thirty-nine thousand, six".