639003 has 8 divisors (see below), whose sum is σ = 879616. Its totient is φ = 412200.

The previous prime is 638999. The next prime is 639007. The reversal of 639003 is 300936.

It is an interprime number because it is at equal distance from previous prime (638999) and next prime (639007).

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

It is not a de Polignac number, because 639003 - 2² = 638999 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 3343 + ... + 3528.

It is an arithmetic number, because the mean of its divisors is an integer number (109952).

2⁶³⁹⁰⁰³ is an apocalyptic number.

639003 is a deficient number, since it is larger than the sum of its proper divisors (240613).

639003 is a wasteful number, since it uses less digits than its factorization.

639003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6905.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 639003 is about 799.3766321328. The cubic root of 639003 is about 86.1326149402.

Adding to 639003 its reverse (300936), we get a palindrome (939939).

It can be divided in two parts, 63900 and 3, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 639003 in words is "six hundred thirty-nine thousand, three".