11187889 has 4 divisors (see below), whose sum is σ = 11201524. Its totient is φ = 11174256.

The previous prime is 11187877. The next prime is 11187899. The reversal of 11187889 is 98878111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98878111 = 2617 ⋅37783.

It can be written as a sum of positive squares in 2 ways, for example, as 8065600 + 3122289 = 2840^2 + 1767^2 .

It is a cyclic number.

It is not a de Polignac number, because 11187889 - 2¹³ = 11179697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11187809) 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, 5502 + ... + 7255.

It is an arithmetic number, because the mean of its divisors is an integer number (2800381).

Almost surely, 2^11187889 is an apocalyptic number.

It is an amenable number.

11187889 is a deficient number, since it is larger than the sum of its proper divisors (13635).

11187889 is an equidigital number, since it uses as much as digits as its factorization.

11187889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13634.

The product of its digits is 32256, while the sum is 43.

The square root of 11187889 is about 3344.8301900097. The cubic root of 11187889 is about 223.6571138437.

The spelling of 11187889 in words is "eleven million, one hundred eighty-seven thousand, eight hundred eighty-nine".