2618645 has 4 divisors (see below), whose sum is σ = 3142380. Its totient is φ = 2094912.

The previous prime is 2618633. The next prime is 2618653. The reversal of 2618645 is 5468162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1868689 + 749956 = 1367^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 2618645 - 2¹⁰ = 2617621 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 261860 + ... + 261869.

It is an arithmetic number, because the mean of its divisors is an integer number (785595).

2^2618645 is an apocalyptic number.

It is an amenable number.

2618645 is a deficient number, since it is larger than the sum of its proper divisors (523735).

2618645 is an equidigital number, since it uses as much as digits as its factorization.

2618645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523734.

The product of its digits is 11520, while the sum is 32.

The square root of 2618645 is about 1618.2227905947. Note that the first 3 decimals coincide. The cubic root of 2618645 is about 137.8347984633.

The spelling of 2618645 in words is "two million, six hundred eighteen thousand, six hundred forty-five".