11809915 has 16 divisors (see below), whose sum is σ = 15757056. Its totient is φ = 8438400.

The previous prime is 11809913. The next prime is 11809933. The reversal of 11809915 is 51990811.

It is not a de Polignac number, because 11809915 - 2¹ = 11809913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11809913) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 916 + ... + 4945.

It is an arithmetic number, because the mean of its divisors is an integer number (984816).

Almost surely, 2^11809915 is an apocalyptic number.

11809915 is a deficient number, since it is larger than the sum of its proper divisors (3947141).

11809915 is a wasteful number, since it uses less digits than its factorization.

11809915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 11809915 is about 3436.5556884765. Note that the first 3 decimals coincide. The cubic root of 11809915 is about 227.7275588057.

The spelling of 11809915 in words is "eleven million, eight hundred nine thousand, nine hundred fifteen".