11890905 has 48 divisors (see below), whose sum is σ = 21868224. Its totient is φ = 5483520.

The previous prime is 11890891. The next prime is 11890909. The reversal of 11890905 is 50909811.

It is not a de Polignac number, because 11890905 - 2⁵ = 11890873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11890909) 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 47 ways as a sum of consecutive naturals, for example, 56250 + ... + 56460.

It is an arithmetic number, because the mean of its divisors is an integer number (455588).

Almost surely, 2^11890905 is an apocalyptic number.

11890905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11890905 is a deficient number, since it is larger than the sum of its proper divisors (9977319).

11890905 is a wasteful number, since it uses less digits than its factorization.

11890905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 11890905 is about 3448.3191557627. The cubic root of 11890905 is about 228.2469431235.

The spelling of 11890905 in words is "eleven million, eight hundred ninety thousand, nine hundred five".