2565409 has 8 divisors (see below), whose sum is σ = 3198528. Its totient is φ = 1998960.

The previous prime is 2565403. The next prime is 2565449. The reversal of 2565409 is 9045652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2565409 - 2⁵ = 2565377 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16582 + ... + 16735.

It is an arithmetic number, because the mean of its divisors is an integer number (399816).

2^2565409 is an apocalyptic number.

It is an amenable number.

2565409 is a deficient number, since it is larger than the sum of its proper divisors (633119).

2565409 is a wasteful number, since it uses less digits than its factorization.

2565409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33335.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2565409 is about 1601.6894205807. The cubic root of 2565409 is about 136.8943544144.

It can be divided in two parts, 256 and 5409, that added together give a palindrome (5665).

The spelling of 2565409 in words is "two million, five hundred sixty-five thousand, four hundred nine".