2640109 has 4 divisors (see below), whose sum is σ = 2643516. Its totient is φ = 2636704.

The previous prime is 2640067. The next prime is 2640137. The reversal of 2640109 is 9010462.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2184484 + 455625 = 1478^2 + 675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640109 - 2⁹ = 2639597 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2640109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87 + ... + 2299.

It is an arithmetic number, because the mean of its divisors is an integer number (660879).

2^2640109 is an apocalyptic number.

It is an amenable number.

2640109 is a deficient number, since it is larger than the sum of its proper divisors (3407).

2640109 is a wasteful number, since it uses less digits than its factorization.

2640109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3406.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2640109 is about 1624.8412230123. The cubic root of 2640109 is about 138.2103666855.

The spelling of 2640109 in words is "two million, six hundred forty thousand, one hundred nine".