12478517 has 4 divisors (see below), whose sum is σ = 12558156. Its totient is φ = 12398880.

The previous prime is 12478513. The next prime is 12478519. The reversal of 12478517 is 71587421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4866436 + 7612081 = 2206^2 + 2759^2 .

It is a cyclic number.

It is not a de Polignac number, because 12478517 - 2² = 12478513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12478511) 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 3 ways as a sum of consecutive naturals, for example, 39584 + ... + 39897.

It is an arithmetic number, because the mean of its divisors is an integer number (3139539).

Almost surely, 2^12478517 is an apocalyptic number.

It is an amenable number.

12478517 is a deficient number, since it is larger than the sum of its proper divisors (79639).

12478517 is an equidigital number, since it uses as much as digits as its factorization.

12478517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79638.

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

The square root of 12478517 is about 3532.4944444401. The cubic root of 12478517 is about 231.9464117708.

The spelling of 12478517 in words is "twelve million, four hundred seventy-eight thousand, five hundred seventeen".