11977709 has 4 divisors (see below), whose sum is σ = 12112380. Its totient is φ = 11843040.

The previous prime is 11977681. The next prime is 11977717. The reversal of 11977709 is 90777911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90777911 = 7 ⋅12968273.

It can be written as a sum of positive squares in 2 ways, for example, as 7856809 + 4120900 = 2803^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 11977709 - 2²⁰ = 10929133 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 (11977739) 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, 67202 + ... + 67379.

It is an arithmetic number, because the mean of its divisors is an integer number (3028095).

Almost surely, 2^11977709 is an apocalyptic number.

It is an amenable number.

11977709 is a deficient number, since it is larger than the sum of its proper divisors (134671).

11977709 is an equidigital number, since it uses as much as digits as its factorization.

11977709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134670.

The product of its (nonzero) digits is 27783, while the sum is 41.

The square root of 11977709 is about 3460.8826908753. The cubic root of 11977709 is about 228.8010005030.

The spelling of 11977709 in words is "eleven million, nine hundred seventy-seven thousand, seven hundred nine".