638459 has 2 divisors, whose sum is σ = 638460. Its totient is φ = 638458.

The previous prime is 638453. The next prime is 638467. The reversal of 638459 is 954836.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638459 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (638453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319229 + 319230.

It is an arithmetic number, because the mean of its divisors is an integer number (319230).

2⁶³⁸⁴⁵⁹ is an apocalyptic number.

638459 is a deficient number, since it is larger than the sum of its proper divisors (1).

638459 is an equidigital number, since it uses as much as digits as its factorization.

638459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 638459 is about 799.0362945449. The cubic root of 638459 is about 86.1081656834.

The spelling of 638459 in words is "six hundred thirty-eight thousand, four hundred fifty-nine".