11910905 has 4 divisors (see below), whose sum is σ = 14293092. Its totient is φ = 9528720.

The previous prime is 11910901. The next prime is 11910923. The reversal of 11910905 is 50901911.

It is a happy number.

11910905 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4787344 + 7123561 = 2188^2 + 2669^2 .

It is not a de Polignac number, because 11910905 - 2² = 11910901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11910901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191086 + ... + 1191095.

It is an arithmetic number, because the mean of its divisors is an integer number (3573273).

Almost surely, 2^11910905 is an apocalyptic number.

It is an amenable number.

11910905 is a deficient number, since it is larger than the sum of its proper divisors (2382187).

11910905 is an equidigital number, since it uses as much as digits as its factorization.

11910905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382186.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 11910905 is about 3451.2179009735. The cubic root of 11910905 is about 228.3748386848.

The spelling of 11910905 in words is "eleven million, nine hundred ten thousand, nine hundred five".