2689647 has 4 divisors (see below), whose sum is σ = 3586200. Its totient is φ = 1793096.

The previous prime is 2689637. The next prime is 2689649. The reversal of 2689647 is 7469862.

2689647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2689647 - 2⁸ = 2689391 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2689599 and 2689608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2689649) 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, 448272 + ... + 448277.

It is an arithmetic number, because the mean of its divisors is an integer number (896550).

2^2689647 is an apocalyptic number.

2689647 is a deficient number, since it is larger than the sum of its proper divisors (896553).

2689647 is an equidigital number, since it uses as much as digits as its factorization.

2689647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896552.

The product of its digits is 145152, while the sum is 42.

The square root of 2689647 is about 1640.0143292057. The cubic root of 2689647 is about 139.0694578937.

The spelling of 2689647 in words is "two million, six hundred eighty-nine thousand, six hundred forty-seven".