11720409 has 16 divisors (see below), whose sum is σ = 16588800. Its totient is φ = 7344656.

The previous prime is 11720407. The next prime is 11720411. The reversal of 11720409 is 90402711.

It is an interprime number because it is at equal distance from previous prime (11720407) and next prime (11720411).

It is a cyclic number.

It is not a de Polignac number, because 11720409 - 2¹ = 11720407 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11720407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2632 + ... + 5510.

It is an arithmetic number, because the mean of its divisors is an integer number (1036800).

Almost surely, 2^11720409 is an apocalyptic number.

It is an amenable number.

11720409 is a deficient number, since it is larger than the sum of its proper divisors (4868391).

11720409 is a wasteful number, since it uses less digits than its factorization.

11720409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 11720409 is about 3423.5082882914. The cubic root of 11720409 is about 227.1507921869.

The spelling of 11720409 in words is "eleven million, seven hundred twenty thousand, four hundred nine".