2309643 has 24 divisors (see below), whose sum is σ = 3881696. Its totient is φ = 1296000.

The previous prime is 2309633. The next prime is 2309663. The reversal of 2309643 is 3469032.

2309643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2309643 - 2¹⁷ = 2178571 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2309633) 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 23 ways as a sum of consecutive naturals, for example, 3543 + ... + 4143.

2^2309643 is an apocalyptic number.

2309643 is a deficient number, since it is larger than the sum of its proper divisors (1572053).

2309643 is a wasteful number, since it uses less digits than its factorization.

2309643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 2309643 is about 1519.7509664415. The cubic root of 2309643 is about 132.1848306052.

The spelling of 2309643 in words is "two million, three hundred nine thousand, six hundred forty-three".