11820889 has 4 divisors (see below), whose sum is σ = 12202240. Its totient is φ = 11439540.

The previous prime is 11820883. The next prime is 11820901. The reversal of 11820889 is 98802811.

11820889 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98802811 = 463 ⋅213397.

It is a cyclic number.

It is not a de Polignac number, because 11820889 - 2⁵ = 11820857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11820883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190629 + ... + 190690.

It is an arithmetic number, because the mean of its divisors is an integer number (3050560).

Almost surely, 2^11820889 is an apocalyptic number.

It is an amenable number.

11820889 is a deficient number, since it is larger than the sum of its proper divisors (381351).

11820889 is an equidigital number, since it uses as much as digits as its factorization.

11820889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381350.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 11820889 is about 3438.1519745352. The cubic root of 11820889 is about 227.7980732439.

The spelling of 11820889 in words is "eleven million, eight hundred twenty thousand, eight hundred eighty-nine".