12520447 has 2 divisors, whose sum is σ = 12520448. Its totient is φ = 12520446.

The previous prime is 12520421. The next prime is 12520451. The reversal of 12520447 is 74402521.

It is a strong prime.

It is an emirp because it is prime and its reverse (74402521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12520447 - 2¹¹ = 12518399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12520477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260223 + 6260224.

It is an arithmetic number, because the mean of its divisors is an integer number (6260224).

Almost surely, 2^12520447 is an apocalyptic number.

12520447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12520447 is an equidigital number, since it uses as much as digits as its factorization.

12520447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 12520447 is about 3538.4243668616. The cubic root of 12520447 is about 232.2059148350.

Adding to 12520447 its reverse (74402521), we get a palindrome (86922968).

The spelling of 12520447 in words is "twelve million, five hundred twenty thousand, four hundred forty-seven".