12690247 has 4 divisors (see below), whose sum is σ = 12864160. Its totient is φ = 12516336.

The previous prime is 12690199. The next prime is 12690259. The reversal of 12690247 is 74209621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12690247 is a prime.

It is a super-2 number, since 2×12690247² = 322084737842018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12690277) 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 in 3 ways as a sum of consecutive naturals, for example, 86847 + ... + 86992.

It is an arithmetic number, because the mean of its divisors is an integer number (3216040).

Almost surely, 2^12690247 is an apocalyptic number.

12690247 is a deficient number, since it is larger than the sum of its proper divisors (173913).

12690247 is an equidigital number, since it uses as much as digits as its factorization.

12690247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173912.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 12690247 is about 3562.3372945301. The cubic root of 12690247 is about 233.2509162439.

Adding to 12690247 its reverse (74209621), we get a palindrome (86899868).

The spelling of 12690247 in words is "twelve million, six hundred ninety thousand, two hundred forty-seven".