2553865 has 4 divisors (see below), whose sum is σ = 3064644. Its totient is φ = 2043088.

The previous prime is 2553857. The next prime is 2553869. The reversal of 2553865 is 5683552.

It is a happy number.

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 1527696 + 1026169 = 1236^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 2553865 - 2³ = 2553857 is a prime.

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 2553865.

It is not an unprimeable number, because it can be changed into a prime (2553869) 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, 255382 + ... + 255391.

It is an arithmetic number, because the mean of its divisors is an integer number (766161).

2^2553865 is an apocalyptic number.

It is an amenable number.

2553865 is a deficient number, since it is larger than the sum of its proper divisors (510779).

2553865 is an equidigital number, since it uses as much as digits as its factorization.

2553865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510778.

The product of its digits is 36000, while the sum is 34.

The square root of 2553865 is about 1598.0816624941. The cubic root of 2553865 is about 136.6887101729.

The spelling of 2553865 in words is "two million, five hundred fifty-three thousand, eight hundred sixty-five".