2543409 has 24 divisors (see below), whose sum is σ = 4185792. Its totient is φ = 1473120.

The previous prime is 2543399. The next prime is 2543413. The reversal of 2543409 is 9043452.

2543409 is a `hidden beast` number, since 254 + 3 + 409 = 666.

It is not a de Polignac number, because 2543409 - 2⁸ = 2543153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1719 + ... + 2835.

It is an arithmetic number, because the mean of its divisors is an integer number (174408).

2^2543409 is an apocalyptic number.

It is an amenable number.

2543409 is a deficient number, since it is larger than the sum of its proper divisors (1642383).

2543409 is a wasteful number, since it uses less digits than its factorization.

2543409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157 (or 1154 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2543409 is about 1594.8068848610. The cubic root of 2543409 is about 136.5019119806.

It can be divided in two parts, 254 and 3409, that added together give a palindrome (3663).

The spelling of 2543409 in words is "two million, five hundred forty-three thousand, four hundred nine".