11809778 has 16 divisors (see below), whose sum is σ = 18475776. Its totient is φ = 5656560.

The previous prime is 11809769. The next prime is 11809793. The reversal of 11809778 is 87790811.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3263 + ... + 5853.

It is an arithmetic number, because the mean of its divisors is an integer number (1154736).

Almost surely, 2^11809778 is an apocalyptic number.

11809778 is a deficient number, since it is larger than the sum of its proper divisors (6665998).

11809778 is a wasteful number, since it uses less digits than its factorization.

11809778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 11809778 is about 3436.5357556702. The cubic root of 11809778 is about 227.7266782237.

The spelling of 11809778 in words is "eleven million, eight hundred nine thousand, seven hundred seventy-eight".