12643515 has 12 divisors (see below), whose sum is σ = 21915504. Its totient is φ = 6743184.

The previous prime is 12643513. The next prime is 12643541. The reversal of 12643515 is 51534621.

12643515 is a `hidden beast` number, since 1 + 2 + 643 + 5 + 15 = 666.

12643515 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12643515 - 2¹ = 12643513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12643511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140439 + ... + 140528.

It is an arithmetic number, because the mean of its divisors is an integer number (1826292).

Almost surely, 2^12643515 is an apocalyptic number.

12643515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12643515 is a deficient number, since it is larger than the sum of its proper divisors (9271989).

12643515 is a wasteful number, since it uses less digits than its factorization.

12643515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280978 (or 280975 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 12643515 is about 3555.7720680606. The cubic root of 12643515 is about 232.9642475551.

The spelling of 12643515 in words is "twelve million, six hundred forty-three thousand, five hundred fifteen".