640603 has 4 divisors (see below), whose sum is σ = 642208. Its totient is φ = 639000.

The previous prime is 640589. The next prime is 640613. The reversal of 640603 is 306046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (160552).

2⁶⁴⁰⁶⁰³ is an apocalyptic number.

640603 is a deficient number, since it is larger than the sum of its proper divisors (1605).

640603 is an equidigital number, since it uses as much as digits as its factorization.

640603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 640603 is about 800.3767862701. The cubic root of 640603 is about 86.2044441914.

Adding to 640603 its reverse (306046), we get a palindrome (946649).

The spelling of 640603 in words is "six hundred forty thousand, six hundred three".