Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  | Total Number of Shares Purchased | Average Price Paid Per Share | Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs | Approximate Dollar Value (in millions) of Shares That May Yet Be Purchased Under the Plan or Programs |
| --- | --- | --- | --- | --- |
| October 2018 | 1,538,432 | $53.25 | 1,538,432 | $3,350 |
| November 2018 | 2,188,178 | $56.38 | 2,188,178 | $3,225 |
| December 2018 | 2,221,305 | $54.22 | 2,221,305 | $3,100 |
| Total | 5,947,915 |  | 5,947,915 |  |
Question:
What are the total number of shares purchased in the period of October 2018 for Delta Airlines?
Answer:
1,538,432