11780909 has 4 divisors (see below), whose sum is σ = 13463904. Its totient is φ = 10097916.

The previous prime is 11780903. The next prime is 11780921. The reversal of 11780909 is 90908711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90908711 = 19 ⋅4784669.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11780909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11780903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841487 + ... + 841500.

It is an arithmetic number, because the mean of its divisors is an integer number (3365976).

Almost surely, 2^11780909 is an apocalyptic number.

It is an amenable number.

11780909 is a deficient number, since it is larger than the sum of its proper divisors (1682995).

11780909 is an equidigital number, since it uses as much as digits as its factorization.

11780909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682994.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 11780909 is about 3432.3328801269. The cubic root of 11780909 is about 227.5409675448.

The spelling of 11780909 in words is "eleven million, seven hundred eighty thousand, nine hundred nine".