639603 has 8 divisors (see below), whose sum is σ = 947600. Its totient is φ = 426384.

The previous prime is 639601. The next prime is 639631. The reversal of 639603 is 306936.

639603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639603 - 2¹ = 639601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 23689 = 639603 / (6 + 3 + 9 + 6 + 0 + 3).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639603.

It is not an unprimeable number, because it can be changed into a prime (639601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11818 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (118450).

2⁶³⁹⁶⁰³ is an apocalyptic number.

639603 is a deficient number, since it is larger than the sum of its proper divisors (307997).

639603 is a wasteful number, since it uses less digits than its factorization.

639603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23698 (or 23692 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 639603 is about 799.7518365093. The cubic root of 639603 is about 86.1595649453.

The spelling of 639603 in words is "six hundred thirty-nine thousand, six hundred three".