12420257 has 2 divisors, whose sum is σ = 12420258. Its totient is φ = 12420256.

The previous prime is 12420229. The next prime is 12420263. The reversal of 12420257 is 75202421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12418576 + 1681 = 3524^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420257 - 2¹⁶ = 12354721 is a prime.

It is not a weakly prime, because it can be changed into another prime (12420227) 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 as a sum of consecutive naturals, namely, 6210128 + 6210129.

It is an arithmetic number, because the mean of its divisors is an integer number (6210129).

Almost surely, 2^12420257 is an apocalyptic number.

It is an amenable number.

12420257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420257 is an equidigital number, since it uses as much as digits as its factorization.

12420257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 12420257 is about 3524.2384993073. The cubic root of 12420257 is about 231.5848762102.

Adding to 12420257 its reverse (75202421), we get a palindrome (87622678).

The spelling of 12420257 in words is "twelve million, four hundred twenty thousand, two hundred fifty-seven".