11718409 has 4 divisors (see below), whose sum is σ = 11767680. Its totient is φ = 11669140.

The previous prime is 11718401. The next prime is 11718419. The reversal of 11718409 is 90481711.

11718409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11718409 - 2³ = 11718401 is a prime.

It is a super-2 number, since 2×11718409² = 274642218982562, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11718401) 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, 24277 + ... + 24754.

It is an arithmetic number, because the mean of its divisors is an integer number (2941920).

Almost surely, 2^11718409 is an apocalyptic number.

It is an amenable number.

11718409 is a deficient number, since it is larger than the sum of its proper divisors (49271).

11718409 is an equidigital number, since it uses as much as digits as its factorization.

11718409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49270.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 11718409 is about 3423.2161778071. The cubic root of 11718409 is about 227.1378709249.

The spelling of 11718409 in words is "eleven million, seven hundred eighteen thousand, four hundred nine".