638047 has 2 divisors, whose sum is σ = 638048. Its totient is φ = 638046.

The previous prime is 638023. The next prime is 638051. The reversal of 638047 is 740836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638047 - 2¹⁹ = 113759 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638147) 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, 319023 + 319024.

It is an arithmetic number, because the mean of its divisors is an integer number (319024).

2⁶³⁸⁰⁴⁷ is an apocalyptic number.

638047 is a deficient number, since it is larger than the sum of its proper divisors (1).

638047 is an equidigital number, since it uses as much as digits as its factorization.

638047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 638047 is about 798.7784423731. The cubic root of 638047 is about 86.0896397232.

The spelling of 638047 in words is "six hundred thirty-eight thousand, forty-seven".