2340409 has 4 divisors (see below), whose sum is σ = 2344420. Its totient is φ = 2336400.

The previous prime is 2340397. The next prime is 2340419. The reversal of 2340409 is 9040432.

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 394384 + 1946025 = 628^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 2340409 - 2¹⁹ = 1816121 is a prime.

It is a Duffinian number.

2340409 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2340409.

It is not an unprimeable number, because it can be changed into a prime (2340419) 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, 942 + ... + 2359.

It is an arithmetic number, because the mean of its divisors is an integer number (586105).

2^2340409 is an apocalyptic number.

It is an amenable number.

2340409 is a deficient number, since it is larger than the sum of its proper divisors (4011).

2340409 is an equidigital number, since it uses as much as digits as its factorization.

2340409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2340409 is about 1529.8395340689. The cubic root of 2340409 is about 132.7691739369.

The spelling of 2340409 in words is "two million, three hundred forty thousand, four hundred nine".