Each of the digits in the number $3571869$ is arranged in ascending order from left to right. The position(s) of how many digits will remain unchanged as compared to that/those in the original number?

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**Solution:**

1. Original number digits: $3 \quad 5 \quad 7 \quad 1 \quad 8 \quad 6 \quad 9$

2. Arrange digits in ascending order: $1 \quad 3 \quad 5 \quad 6 \quad 7 \quad 8 \quad 9$

3. Compare each digit's position in the original and the ascending order:
   - Position 1: Original $3$, Ascending $1$ (different)
   - Position 2: Original $5$, Ascending $3$ (different)
   - Position 3: Original $7$, Ascending $5$ (different)
   - Position 4: Original $1$, Ascending $6$ (different)
   - Position 5: Original $8$, Ascending $7$ (different)
   - Position 6: Original $6$, Ascending $8$ (different)
   - Position 7: Original $9$, Ascending $9$ (same)

4. Only the digit $9$ at position 7 remains unchanged.

**Answer:** One

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