6639003 has 28 divisors (see below), whose sum is σ = 11384688. Its totient is φ = 3790800.

The previous prime is 6639001. The next prime is 6639011. The reversal of 6639003 is 3009366.

It is not a de Polignac number, because 6639003 - 2¹ = 6639001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

6639003 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6639001) 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 27 ways as a sum of consecutive naturals, for example, 4453 + ... + 5753.

It is an arithmetic number, because the mean of its divisors is an integer number (406596).

Almost surely, 2^6639003 is an apocalyptic number.

6639003 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

6639003 is a deficient number, since it is larger than the sum of its proper divisors (4745685).

6639003 is an equidigital number, since it uses as much as digits as its factorization.

6639003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326 (or 1311 counting only the distinct ones).

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

The square root of 6639003 is about 2576.6262825641. The cubic root of 6639003 is about 187.9465197963.

The spelling of 6639003 in words is "six million, six hundred thirty-nine thousand, three".