2655865 has 4 divisors (see below), whose sum is σ = 3187044. Its totient is φ = 2124688.

The previous prime is 2655853. The next prime is 2655881. The reversal of 2655865 is 5685562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5685562 = 2 ⋅2842781.

It can be written as a sum of positive squares in 2 ways, for example, as 1225449 + 1430416 = 1107^2 + 1196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2655865 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, 265582 + ... + 265591.

It is an arithmetic number, because the mean of its divisors is an integer number (796761).

2^2655865 is an apocalyptic number.

It is an amenable number.

2655865 is a deficient number, since it is larger than the sum of its proper divisors (531179).

2655865 is an equidigital number, since it uses as much as digits as its factorization.

2655865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531178.

The product of its digits is 72000, while the sum is 37.

The square root of 2655865 is about 1629.6824844122. The cubic root of 2655865 is about 138.4847650574.

The spelling of 2655865 in words is "two million, six hundred fifty-five thousand, eight hundred sixty-five".