739

This number is a prime.

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The only 3-digit prime (emirp) that remains prime when its leading digit is replaced by any digit that is equal to a power of 2, i.e., 1, 2, 4, 8. [Loungrides]

The smallest emirp that has a maximum product of digits for a prime sum of digits. [Loungrides]

The start of five consecutive emirps in the sequence of Ulam primes, i.e., 739, 751, 983, 991, 1103. [Loungrides]

7^39 is a 33-digit number without a 7 in it. Can you find a larger power of 7 without the digit 7 in it? [Loungrides]