12729919 has 2 divisors, whose sum is σ = 12729920. Its totient is φ = 12729918.

The previous prime is 12729917. The next prime is 12729947. The reversal of 12729919 is 91992721.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (91992721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12729919 - 2¹ = 12729917 is a prime.

It is a super-2 number, since 2×12729919² = 324101675493122, which contains 22 as substring.

Together with 12729917, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12729917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364959 + 6364960.

It is an arithmetic number, because the mean of its divisors is an integer number (6364960).

Almost surely, 2^12729919 is an apocalyptic number.

12729919 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729919 is an equidigital number, since it uses as much as digits as its factorization.

12729919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 40.

The square root of 12729919 is about 3567.9012037891. The cubic root of 12729919 is about 233.4937248702.

The spelling of 12729919 in words is "twelve million, seven hundred twenty-nine thousand, nine hundred nineteen".