640303 has 2 divisors, whose sum is σ = 640304. Its totient is φ = 640302.

The previous prime is 640279. The next prime is 640307. The reversal of 640303 is 303046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640303 is a prime.

640303 is a modest number, since divided by 303 gives 64 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640307) 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 as a sum of consecutive naturals, namely, 320151 + 320152.

It is an arithmetic number, because the mean of its divisors is an integer number (320152).

2⁶⁴⁰³⁰³ is an apocalyptic number.

640303 is a deficient number, since it is larger than the sum of its proper divisors (1).

640303 is an equidigital number, since it uses as much as digits as its factorization.

640303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 640303 is about 800.1893525910. The cubic root of 640303 is about 86.1909853246.

Adding to 640303 its reverse (303046), we get a palindrome (943349).

The spelling of 640303 in words is "six hundred forty thousand, three hundred three".