11784989 has 4 divisors (see below), whose sum is σ = 11814780. Its totient is φ = 11755200.

The previous prime is 11784953. The next prime is 11785001. The reversal of 11784989 is 98948711.

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 8508889 + 3276100 = 2917^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 11784989 - 2²⁰ = 10736413 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 (11784919) 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, 14294 + ... + 15095.

It is an arithmetic number, because the mean of its divisors is an integer number (2953695).

Almost surely, 2^11784989 is an apocalyptic number.

It is an amenable number.

11784989 is a deficient number, since it is larger than the sum of its proper divisors (29791).

11784989 is an equidigital number, since it uses as much as digits as its factorization.

11784989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29790.

The product of its digits is 145152, while the sum is 47.

The square root of 11784989 is about 3432.9271766235. The cubic root of 11784989 is about 227.5672320714.

The spelling of 11784989 in words is "eleven million, seven hundred eighty-four thousand, nine hundred eighty-nine".