11689921 has 4 divisors (see below), whose sum is σ = 12305200. Its totient is φ = 11074644.

The previous prime is 11689919. The next prime is 11689939. The reversal of 11689921 is 12998611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11689921 - 2¹ = 11689919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11689901) 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 3 ways as a sum of consecutive naturals, for example, 307611 + ... + 307648.

It is an arithmetic number, because the mean of its divisors is an integer number (3076300).

Almost surely, 2^11689921 is an apocalyptic number.

It is an amenable number.

11689921 is a deficient number, since it is larger than the sum of its proper divisors (615279).

11689921 is an equidigital number, since it uses as much as digits as its factorization.

11689921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615278.

The product of its digits is 7776, while the sum is 37.

The square root of 11689921 is about 3419.0526465675. The cubic root of 11689921 is about 226.9536606426.

The spelling of 11689921 in words is "eleven million, six hundred eighty-nine thousand, nine hundred twenty-one".