638303 has 2 divisors, whose sum is σ = 638304. Its totient is φ = 638302.

The previous prime is 638269. The next prime is 638317. The reversal of 638303 is 303836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638303 - 2⁸ = 638047 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is equal to p₅₁₉₆₂ and since 638303 and 51962 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (608303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319151 + 319152.

It is an arithmetic number, because the mean of its divisors is an integer number (319152).

2⁶³⁸³⁰³ is an apocalyptic number.

638303 is a deficient number, since it is larger than the sum of its proper divisors (1).

638303 is an equidigital number, since it uses as much as digits as its factorization.

638303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 638303 is about 798.9386709880. The cubic root of 638303 is about 86.1011519372.

The spelling of 638303 in words is "six hundred thirty-eight thousand, three hundred three".