2566409 has 8 divisors (see below), whose sum is σ = 2694912. Its totient is φ = 2439360.

The previous prime is 2566367. The next prime is 2566411. The reversal of 2566409 is 9046652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2566409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2566469) 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, 5312 + ... + 5774.

It is an arithmetic number, because the mean of its divisors is an integer number (336864).

2^2566409 is an apocalyptic number.

It is an amenable number.

2566409 is a deficient number, since it is larger than the sum of its proper divisors (128503).

2566409 is a wasteful number, since it uses less digits than its factorization.

2566409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2566409 is about 1602.0015605486. The cubic root of 2566409 is about 136.9121393071.

The spelling of 2566409 in words is "two million, five hundred sixty-six thousand, four hundred nine".