3128647 has 2 divisors, whose sum is σ = 3128648. Its totient is φ = 3128646.

The previous prime is 3128641. The next prime is 3128651. The reversal of 3128647 is 7468213.

It is a strong prime.

It is an emirp because it is prime and its reverse (7468213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3128647 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3128641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564323 + 1564324.

It is an arithmetic number, because the mean of its divisors is an integer number (1564324).

Almost surely, 2^3128647 is an apocalyptic number.

3128647 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128647 is an equidigital number, since it uses as much as digits as its factorization.

3128647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 3128647 is about 1768.7981795558. The cubic root of 3128647 is about 146.2577388945.

The spelling of 3128647 in words is "three million, one hundred twenty-eight thousand, six hundred forty-seven".