12617647 has 6 divisors (see below), whose sum is σ = 14677728. Its totient is φ = 10815084.

The previous prime is 12617609. The next prime is 12617659. The reversal of 12617647 is 74671621.

12617647 = T₆₉₃ + T₆₉₄ + ... + T₇₄₁.

It is a happy number.

12617647 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12617647 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 (12617677) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128703 + ... + 128800.

It is an arithmetic number, because the mean of its divisors is an integer number (2446288).

Almost surely, 2^12617647 is an apocalyptic number.

12617647 is a deficient number, since it is larger than the sum of its proper divisors (2060081).

12617647 is an equidigital number, since it uses as much as digits as its factorization.

12617647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257517 (or 257510 counting only the distinct ones).

The product of its digits is 14112, while the sum is 34.

The square root of 12617647 is about 3552.1327396369. The cubic root of 12617647 is about 232.8052613427.

The spelling of 12617647 in words is "twelve million, six hundred seventeen thousand, six hundred forty-seven".