11687789 has 4 divisors (see below), whose sum is σ = 12375324. Its totient is φ = 11000256.

The previous prime is 11687771. The next prime is 11687801. The reversal of 11687789 is 98778611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5522500 + 6165289 = 2350^2 + 2483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11687789 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 (11687759) 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, 343742 + ... + 343775.

It is an arithmetic number, because the mean of its divisors is an integer number (3093831).

Almost surely, 2^11687789 is an apocalyptic number.

It is an amenable number.

11687789 is a deficient number, since it is larger than the sum of its proper divisors (687535).

11687789 is an equidigital number, since it uses as much as digits as its factorization.

11687789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687534.

The product of its digits is 169344, while the sum is 47.

The square root of 11687789 is about 3418.7408500792. The cubic root of 11687789 is about 226.9398625847.

The spelling of 11687789 in words is "eleven million, six hundred eighty-seven thousand, seven hundred eighty-nine".