2540409 has 8 divisors (see below), whose sum is σ = 3396000. Its totient is φ = 1689216.

The previous prime is 2540407. The next prime is 2540413. The reversal of 2540409 is 9040452.

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

It is not a de Polignac number, because 2540409 - 2¹ = 2540407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540407) 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, 649 + ... + 2345.

It is an arithmetic number, because the mean of its divisors is an integer number (424500).

2^2540409 is an apocalyptic number.

It is an amenable number.

2540409 is a deficient number, since it is larger than the sum of its proper divisors (855591).

2540409 is a wasteful number, since it uses less digits than its factorization.

2540409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2540409 is about 1593.8660545981. The cubic root of 2540409 is about 136.4482219858.

The spelling of 2540409 in words is "two million, five hundred forty thousand, four hundred nine".