11843989 has 4 divisors (see below), whose sum is σ = 11864556. Its totient is φ = 11823424.

The previous prime is 11843983. The next prime is 11843999. The reversal of 11843989 is 98934811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5880625 + 5963364 = 2425^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 11843989 - 2³ = 11843981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11843981) 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, 9394 + ... + 10579.

It is an arithmetic number, because the mean of its divisors is an integer number (2966139).

Almost surely, 2^11843989 is an apocalyptic number.

It is an amenable number.

11843989 is a deficient number, since it is larger than the sum of its proper divisors (20567).

11843989 is an equidigital number, since it uses as much as digits as its factorization.

11843989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20566.

The product of its digits is 62208, while the sum is 43.

The square root of 11843989 is about 3441.5096977925. The cubic root of 11843989 is about 227.9463619079.

The spelling of 11843989 in words is "eleven million, eight hundred forty-three thousand, nine hundred eighty-nine".