12478457 has 2 divisors, whose sum is σ = 12478458. Its totient is φ = 12478456.

The previous prime is 12478451. The next prime is 12478483. The reversal of 12478457 is 75487421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6446521 + 6031936 = 2539^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 12478457 - 2⁶ = 12478393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12478457.

It is not a weakly prime, because it can be changed into another prime (12478451) 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, 6239228 + 6239229.

It is an arithmetic number, because the mean of its divisors is an integer number (6239229).

Almost surely, 2^12478457 is an apocalyptic number.

It is an amenable number.

12478457 is a deficient number, since it is larger than the sum of its proper divisors (1).

12478457 is an equidigital number, since it uses as much as digits as its factorization.

12478457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 38.

The square root of 12478457 is about 3532.4859518475. The cubic root of 12478457 is about 231.9460400170.

The spelling of 12478457 in words is "twelve million, four hundred seventy-eight thousand, four hundred fifty-seven".