12457919 has 2 divisors, whose sum is σ = 12457920. Its totient is φ = 12457918.

The previous prime is 12457897. The next prime is 12457931. The reversal of 12457919 is 91975421.

It is a strong prime.

It is an emirp because it is prime and its reverse (91975421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12457919 - 2⁸ = 12457663 is a prime.

It is a super-2 number, since 2×12457919² = 310399491621122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12457979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6228959 + 6228960.

It is an arithmetic number, because the mean of its divisors is an integer number (6228960).

Almost surely, 2^12457919 is an apocalyptic number.

12457919 is a deficient number, since it is larger than the sum of its proper divisors (1).

12457919 is an equidigital number, since it uses as much as digits as its factorization.

12457919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 12457919 is about 3529.5777367838. The cubic root of 12457919 is about 231.8187186221.

The spelling of 12457919 in words is "twelve million, four hundred fifty-seven thousand, nine hundred nineteen".