2440409 has 4 divisors (see below), whose sum is σ = 2506404. Its totient is φ = 2374416.

The previous prime is 2440393. The next prime is 2440411. The reversal of 2440409 is 9040442.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1795600 + 644809 = 1340^2 + 803^2 .

It is a cyclic number.

It is not a de Polignac number, because 2440409 - 2⁴ = 2440393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2440439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32942 + ... + 33015.

It is an arithmetic number, because the mean of its divisors is an integer number (626601).

2^2440409 is an apocalyptic number.

It is an amenable number.

2440409 is a deficient number, since it is larger than the sum of its proper divisors (65995).

2440409 is an equidigital number, since it uses as much as digits as its factorization.

2440409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65994.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 2440409 is about 1562.1808474053. The cubic root of 2440409 is about 134.6338316782.

The spelling of 2440409 in words is "two million, four hundred forty thousand, four hundred nine".