11989709 has 4 divisors (see below), whose sum is σ = 12695004. Its totient is φ = 11284416.

The previous prime is 11989697. The next prime is 11989721. The reversal of 11989709 is 90798911.

11989709 is digitally balanced in base 3, 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.

It is an interprime number because it is at equal distance from previous prime (11989697) and next prime (11989721).

It can be written as a sum of positive squares in 2 ways, for example, as 4818025 + 7171684 = 2195^2 + 2678^2 .

It is a cyclic number.

It is not a de Polignac number, because 11989709 - 2¹⁶ = 11924173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11989709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989799) 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, 352622 + ... + 352655.

It is an arithmetic number, because the mean of its divisors is an integer number (3173751).

Almost surely, 2^11989709 is an apocalyptic number.

It is an amenable number.

11989709 is a deficient number, since it is larger than the sum of its proper divisors (705295).

11989709 is an equidigital number, since it uses as much as digits as its factorization.

11989709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705294.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 11989709 is about 3462.6159186372. The cubic root of 11989709 is about 228.8773839363.

The spelling of 11989709 in words is "eleven million, nine hundred eighty-nine thousand, seven hundred nine".