11989843 has 4 divisors (see below), whose sum is σ = 11998600. Its totient is φ = 11981088.

The previous prime is 11989837. The next prime is 11989883. The reversal of 11989843 is 34898911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34898911 = 587 ⋅59453.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11989843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11989843.

It is not an unprimeable number, because it can be changed into a prime (11989823) 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, 1830 + ... + 5227.

It is an arithmetic number, because the mean of its divisors is an integer number (2999650).

Almost surely, 2^11989843 is an apocalyptic number.

11989843 is a deficient number, since it is larger than the sum of its proper divisors (8757).

11989843 is an equidigital number, since it uses as much as digits as its factorization.

11989843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8756.

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

The square root of 11989843 is about 3462.6352681159. The cubic root of 11989843 is about 228.8782365968.

The spelling of 11989843 in words is "eleven million, nine hundred eighty-nine thousand, eight hundred forty-three".