11981843 has 4 divisors (see below), whose sum is σ = 12395040. Its totient is φ = 11568648.

The previous prime is 11981839. The next prime is 11981863. The reversal of 11981843 is 34818911.

11981843 is digitally balanced in base 2, 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.

It is a cyclic number.

It is not a de Polignac number, because 11981843 - 2² = 11981839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11981813) 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, 206555 + ... + 206612.

It is an arithmetic number, because the mean of its divisors is an integer number (3098760).

Almost surely, 2^11981843 is an apocalyptic number.

11981843 is a deficient number, since it is larger than the sum of its proper divisors (413197).

11981843 is an equidigital number, since it uses as much as digits as its factorization.

11981843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413196.

The product of its digits is 6912, while the sum is 35.

The square root of 11981843 is about 3461.4798858292. The cubic root of 11981843 is about 228.8273203537.

The spelling of 11981843 in words is "eleven million, nine hundred eighty-one thousand, eight hundred forty-three".