2643647 has 2 divisors, whose sum is σ = 2643648. Its totient is φ = 2643646.

The previous prime is 2643629. The next prime is 2643659. The reversal of 2643647 is 7463462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2643647 - 2⁶ = 2643583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643607) 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 as a sum of consecutive naturals, namely, 1321823 + 1321824.

It is an arithmetic number, because the mean of its divisors is an integer number (1321824).

2^2643647 is an apocalyptic number.

2643647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643647 is an equidigital number, since it uses as much as digits as its factorization.

2643647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 32.

The square root of 2643647 is about 1625.9295802709. The cubic root of 2643647 is about 138.2720775226.

The spelling of 2643647 in words is "two million, six hundred forty-three thousand, six hundred forty-seven".