2640265 has 4 divisors (see below), whose sum is σ = 3168324. Its totient is φ = 2112208.

The previous prime is 2640251. The next prime is 2640271. The reversal of 2640265 is 5620462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5620462 = 2 ⋅2810231.

It can be written as a sum of positive squares in 2 ways, for example, as 635209 + 2005056 = 797^2 + 1416^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640265 - 2⁷ = 2640137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264022 + ... + 264031.

It is an arithmetic number, because the mean of its divisors is an integer number (792081).

2^2640265 is an apocalyptic number.

It is an amenable number.

2640265 is a deficient number, since it is larger than the sum of its proper divisors (528059).

2640265 is an equidigital number, since it uses as much as digits as its factorization.

2640265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528058.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 2640265 is about 1624.8892269936. The cubic root of 2640265 is about 138.2130888449.

The spelling of 2640265 in words is "two million, six hundred forty thousand, two hundred sixty-five".