12457817 has 2 divisors, whose sum is σ = 12457818. Its totient is φ = 12457816.

The previous prime is 12457813. The next prime is 12457859. The reversal of 12457817 is 71875421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7722841 + 4734976 = 2779^2 + 2176^2 .

It is a cyclic number.

It is not a de Polignac number, because 12457817 - 2² = 12457813 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12457813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6228908 + 6228909.

It is an arithmetic number, because the mean of its divisors is an integer number (6228909).

Almost surely, 2^12457817 is an apocalyptic number.

It is an amenable number.

12457817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12457817 is an equidigital number, since it uses as much as digits as its factorization.

12457817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 35.

The square root of 12457817 is about 3529.5632874337. The cubic root of 12457817 is about 231.8180859436.

The spelling of 12457817 in words is "twelve million, four hundred fifty-seven thousand, eight hundred seventeen".