12912457 has 4 divisors (see below), whose sum is σ = 13592080. Its totient is φ = 12232836.

The previous prime is 12912437. The next prime is 12912479. The reversal of 12912457 is 75421921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12912457 - 2¹⁹ = 12388169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12912437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339783 + ... + 339820.

It is an arithmetic number, because the mean of its divisors is an integer number (3398020).

Almost surely, 2^12912457 is an apocalyptic number.

It is an amenable number.

12912457 is a deficient number, since it is larger than the sum of its proper divisors (679623).

12912457 is an equidigital number, since it uses as much as digits as its factorization.

12912457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679622.

The product of its digits is 5040, while the sum is 31.

The square root of 12912457 is about 3593.3907385643. The cubic root of 12912457 is about 234.6044772774.

The spelling of 12912457 in words is "twelve million, nine hundred twelve thousand, four hundred fifty-seven".