2645643 has 32 divisors (see below), whose sum is σ = 4741632. Its totient is φ = 1267200.

The previous prime is 2645639. The next prime is 2645647. The reversal of 2645643 is 3465462.

2645643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2645639) and next prime (2645647).

It is not a de Polignac number, because 2645643 - 2² = 2645639 is a prime.

2645643 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2645643.

It is not an unprimeable number, because it can be changed into a prime (2645647) 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 31 ways as a sum of consecutive naturals, for example, 2563 + ... + 3443.

It is an arithmetic number, because the mean of its divisors is an integer number (148176).

2^2645643 is an apocalyptic number.

2645643 is a deficient number, since it is larger than the sum of its proper divisors (2095989).

2645643 is a wasteful number, since it uses less digits than its factorization.

2645643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915.

The product of its digits is 17280, while the sum is 30.

The square root of 2645643 is about 1626.5432671774. The cubic root of 2645643 is about 138.3068680521.

The spelling of 2645643 in words is "two million, six hundred forty-five thousand, six hundred forty-three".