638567 has 2 divisors, whose sum is σ = 638568. Its totient is φ = 638566.

The previous prime is 638527. The next prime is 638581. The reversal of 638567 is 765836.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638567 - 2¹⁰ = 637543 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁷ + 3² + 5⁷ + 8³ + 6⁷ + 7² .

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

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638527) 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 as a sum of consecutive naturals, namely, 319283 + 319284.

It is an arithmetic number, because the mean of its divisors is an integer number (319284).

2⁶³⁸⁵⁶⁷ is an apocalyptic number.

638567 is a deficient number, since it is larger than the sum of its proper divisors (1).

638567 is an equidigital number, since it uses as much as digits as its factorization.

638567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 638567 is about 799.1038730979. The cubic root of 638567 is about 86.1130206845.

The spelling of 638567 in words is "six hundred thirty-eight thousand, five hundred sixty-seven".