11965905 has 24 divisors (see below), whose sum is σ = 23704512. Its totient is φ = 5469984.

The previous prime is 11965903. The next prime is 11965913. The reversal of 11965905 is 50956911.

It is not a de Polignac number, because 11965905 - 2¹ = 11965903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11965905.

It is not an unprimeable number, because it can be changed into a prime (11965901) 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 23 ways as a sum of consecutive naturals, for example, 18679 + ... + 19308.

It is an arithmetic number, because the mean of its divisors is an integer number (987688).

Almost surely, 2^11965905 is an apocalyptic number.

11965905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11965905 is a deficient number, since it is larger than the sum of its proper divisors (11738607).

11965905 is a wasteful number, since it uses less digits than its factorization.

11965905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38005 (or 38002 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 11965905 is about 3459.1769252237. The cubic root of 11965905 is about 228.7258148757.

The spelling of 11965905 in words is "eleven million, nine hundred sixty-five thousand, nine hundred five".