11809955 has 4 divisors (see below), whose sum is σ = 14171952. Its totient is φ = 9447960.

The previous prime is 11809949. The next prime is 11809979. The reversal of 11809955 is 55990811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55990811 = 523 ⋅107057.

It is not a de Polignac number, because 11809955 - 2¹⁶ = 11744419 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180991 + ... + 1181000.

It is an arithmetic number, because the mean of its divisors is an integer number (3542988).

Almost surely, 2^11809955 is an apocalyptic number.

11809955 is a deficient number, since it is larger than the sum of its proper divisors (2361997).

11809955 is an equidigital number, since it uses as much as digits as its factorization.

11809955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361996.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 11809955 is about 3436.5615082521. The cubic root of 11809955 is about 227.7278159086.

The spelling of 11809955 in words is "eleven million, eight hundred nine thousand, nine hundred fifty-five".