639009003 has 4 divisors (see below), whose sum is σ = 852012008. Its totient is φ = 426006000.

The previous prime is 639009001. The next prime is 639009089. The reversal of 639009003 is 300900936.

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

It is not a de Polignac number, because 639009003 - 2¹ = 639009001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639009001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106501498 + ... + 106501503.

It is an arithmetic number, because the mean of its divisors is an integer number (213003002).

Almost surely, 2^639009003 is an apocalyptic number.

639009003 is a deficient number, since it is larger than the sum of its proper divisors (213003005).

639009003 is a wasteful number, since it uses less digits than its factorization.

639009003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213003004.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 639009003 is about 25278.6273954897. The cubic root of 639009003 is about 861.3288465854.

Adding to 639009003 its reverse (300900936), we get a palindrome (939909939).

The spelling of 639009003 in words is "six hundred thirty-nine million, nine thousand, three".