639627 has 4 divisors (see below), whose sum is σ = 852840. Its totient is φ = 426416.

The previous prime is 639601. The next prime is 639631. The reversal of 639627 is 726936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 639627 - 2⁶ = 639563 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639627.

It is not an unprimeable number, because it can be changed into a prime (639637) 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, 106602 + ... + 106607.

It is an arithmetic number, because the mean of its divisors is an integer number (213210).

2⁶³⁹⁶²⁷ is an apocalyptic number.

639627 is a deficient number, since it is larger than the sum of its proper divisors (213213).

639627 is a wasteful number, since it uses less digits than its factorization.

639627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213212.

The product of its digits is 13608, while the sum is 33.

The square root of 639627 is about 799.7668410231. The cubic root of 639627 is about 86.1606425949.

The spelling of 639627 in words is "six hundred thirty-nine thousand, six hundred twenty-seven".