12817247 has 4 divisors (see below), whose sum is σ = 12826776. Its totient is φ = 12807720.

The previous prime is 12817213. The next prime is 12817307. The reversal of 12817247 is 74271821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74271821 = 13 ⋅5713217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12817247 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 (12817547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2333 + ... + 5574.

It is an arithmetic number, because the mean of its divisors is an integer number (3206694).

Almost surely, 2^12817247 is an apocalyptic number.

12817247 is a deficient number, since it is larger than the sum of its proper divisors (9529).

12817247 is an equidigital number, since it uses as much as digits as its factorization.

12817247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528.

The product of its digits is 6272, while the sum is 32.

The square root of 12817247 is about 3580.1182941350. The cubic root of 12817247 is about 234.0264355163.

The spelling of 12817247 in words is "twelve million, eight hundred seventeen thousand, two hundred forty-seven".