11891789 has 16 divisors (see below), whose sum is σ = 15499008. Its totient is φ = 8854272.

The previous prime is 11891771. The next prime is 11891797. The reversal of 11891789 is 98719811.

It is a de Polignac number, because none of the positive numbers 2^k-11891789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11891389) 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 15 ways as a sum of consecutive naturals, for example, 2297 + ... + 5390.

It is an arithmetic number, because the mean of its divisors is an integer number (968688).

Almost surely, 2^11891789 is an apocalyptic number.

It is an amenable number.

11891789 is a deficient number, since it is larger than the sum of its proper divisors (3607219).

11891789 is a wasteful number, since it uses less digits than its factorization.

11891789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7724.

The product of its digits is 36288, while the sum is 44.

The square root of 11891789 is about 3448.4473317712. The cubic root of 11891789 is about 228.2525991354.

The spelling of 11891789 in words is "eleven million, eight hundred ninety-one thousand, seven hundred eighty-nine".