11809797 has 4 divisors (see below), whose sum is σ = 15746400. Its totient is φ = 7873196.

The previous prime is 11809793. The next prime is 11809799. The reversal of 11809797 is 79790811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11809797 - 2² = 11809793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11809793) 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, 1968297 + ... + 1968302.

It is an arithmetic number, because the mean of its divisors is an integer number (3936600).

Almost surely, 2^11809797 is an apocalyptic number.

It is an amenable number.

11809797 is a deficient number, since it is larger than the sum of its proper divisors (3936603).

11809797 is an equidigital number, since it uses as much as digits as its factorization.

11809797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936602.

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

The square root of 11809797 is about 3436.5385200809. The cubic root of 11809797 is about 227.7268003486.

The spelling of 11809797 in words is "eleven million, eight hundred nine thousand, seven hundred ninety-seven".