11811895 has 16 divisors (see below), whose sum is σ = 14652288. Its totient is φ = 9135360.

The previous prime is 11811887. The next prime is 11811913. The reversal of 11811895 is 59811811.

It is not a de Polignac number, because 11811895 - 2³ = 11811887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11811895.

It is a congruent number.

It is an unprimeable number.

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, 32002 + ... + 32368.

It is an arithmetic number, because the mean of its divisors is an integer number (915768).

Almost surely, 2^11811895 is an apocalyptic number.

11811895 is a deficient number, since it is larger than the sum of its proper divisors (2840393).

11811895 is a wasteful number, since it uses less digits than its factorization.

11811895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570.

The product of its digits is 2880, while the sum is 34.

The square root of 11811895 is about 3436.8437555408. The cubic root of 11811895 is about 227.7402847051.

The spelling of 11811895 in words is "eleven million, eight hundred eleven thousand, eight hundred ninety-five".