2557409 has 8 divisors (see below), whose sum is σ = 2645352. Its totient is φ = 2471040.

The previous prime is 2557397. The next prime is 2557417. The reversal of 2557409 is 9047552.

It can be written as a sum of positive squares in 4 ways, for example, as 1056784 + 1500625 = 1028^2 + 1225^2 .

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 2557409 - 2²⁰ = 1508833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557909) 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, 3539 + ... + 4199.

It is an arithmetic number, because the mean of its divisors is an integer number (330669).

2^2557409 is an apocalyptic number.

It is an amenable number.

2557409 is a deficient number, since it is larger than the sum of its proper divisors (87943).

2557409 is an equidigital number, since it uses as much as digits as its factorization.

2557409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 2557409 is about 1599.1901075232. The cubic root of 2557409 is about 136.7519086169.

The spelling of 2557409 in words is "two million, five hundred fifty-seven thousand, four hundred nine".