12457997 has 4 divisors (see below), whose sum is σ = 12520800. Its totient is φ = 12395196.

The previous prime is 12457993. The next prime is 12458009. The reversal of 12457997 is 79975421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79975421 = 67 ⋅1193663.

It is a cyclic number.

It is not a de Polignac number, because 12457997 - 2² = 12457993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12457993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31103 + ... + 31500.

It is an arithmetic number, because the mean of its divisors is an integer number (3130200).

Almost surely, 2^12457997 is an apocalyptic number.

It is an amenable number.

12457997 is a deficient number, since it is larger than the sum of its proper divisors (62803).

12457997 is an equidigital number, since it uses as much as digits as its factorization.

12457997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62802.

The product of its digits is 158760, while the sum is 44.

The square root of 12457997 is about 3529.5887862469. The cubic root of 12457997 is about 231.8192024328.

The spelling of 12457997 in words is "twelve million, four hundred fifty-seven thousand, nine hundred ninety-seven".