11689881 has 24 divisors (see below), whose sum is σ = 18260064. Its totient is φ = 6632640.

The previous prime is 11689859. The next prime is 11689889. The reversal of 11689881 is 18898611.

It is not a de Polignac number, because 11689881 - 2⁵ = 11689849 is a prime.

It is a super-2 number, since 2×11689881² = 273306635588322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11689889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41166 + ... + 41448.

It is an arithmetic number, because the mean of its divisors is an integer number (760836).

Almost surely, 2^11689881 is an apocalyptic number.

It is an amenable number.

11689881 is a deficient number, since it is larger than the sum of its proper divisors (6570183).

11689881 is a wasteful number, since it uses less digits than its factorization.

11689881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 574 counting only the distinct ones).

The product of its digits is 27648, while the sum is 42.

The square root of 11689881 is about 3419.0467969889. The cubic root of 11689881 is about 226.9534017827.

The spelling of 11689881 in words is "eleven million, six hundred eighty-nine thousand, eight hundred eighty-one".