638147 has 2 divisors, whose sum is σ = 638148. Its totient is φ = 638146.

The previous prime is 638123. The next prime is 638159. The reversal of 638147 is 741836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638147 - 2¹⁸ = 376003 is a prime.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (638117) 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, 319073 + 319074.

It is an arithmetic number, because the mean of its divisors is an integer number (319074).

2⁶³⁸¹⁴⁷ is an apocalyptic number.

638147 is a deficient number, since it is larger than the sum of its proper divisors (1).

638147 is an equidigital number, since it uses as much as digits as its factorization.

638147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 638147 is about 798.8410355008. The cubic root of 638147 is about 86.0941370482.

The spelling of 638147 in words is "six hundred thirty-eight thousand, one hundred forty-seven".