1439
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Number
$1439$ (one thousand, four hundred and thirty-nine) is:
- The $228$th prime number.
- The $32$nd safe prime after $5$, $7$, $11$, $23$, $47$, $\ldots$, $839$, $863$, $887$, $983$, $1019$, $1187$, $1283$, $1307$, $1319$, $1367$:
- $1439 = 2 \times 719 + 1$
- The $47$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $1031$, $1049$, $1103$, $1223$, $1229$, $1289$, $1409$:
- $2 \times 1439 + 1 = 2879$, which is prime.
- The $5$th term after $89$, $179$, $359$, $719$ of the smallest Cunningham chain of the first kind of length $6$:
- $\tuple {89, 179, 359, 719, 1439, 2879}$