11809779 has 4 divisors (see below), whose sum is σ = 15746376. Its totient is φ = 7873184.

The previous prime is 11809769. The next prime is 11809793. The reversal of 11809779 is 97790811.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11809779 - 2¹⁵ = 11777011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11809779.

It is not an unprimeable number, because it can be changed into a prime (11809709) 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, 1968294 + ... + 1968299.

It is an arithmetic number, because the mean of its divisors is an integer number (3936594).

Almost surely, 2^11809779 is an apocalyptic number.

11809779 is a deficient number, since it is larger than the sum of its proper divisors (3936597).

11809779 is an equidigital number, since it uses as much as digits as its factorization.

11809779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936596.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 11809779 is about 3436.5359011656. The cubic root of 11809779 is about 227.7266846513.

The spelling of 11809779 in words is "eleven million, eight hundred nine thousand, seven hundred seventy-nine".