11983891 has 4 divisors (see below), whose sum is σ = 12028384. Its totient is φ = 11939400.

The previous prime is 11983879. The next prime is 11983901. The reversal of 11983891 is 19838911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19838911 = 1019 ⋅19469.

It is a cyclic number.

It is not a de Polignac number, because 11983891 - 2⁵ = 11983859 is a prime.

It is a super-2 number, since 2×11983891² = 287227286999762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11983841) 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, 21840 + ... + 22381.

It is an arithmetic number, because the mean of its divisors is an integer number (3007096).

Almost surely, 2^11983891 is an apocalyptic number.

11983891 is a deficient number, since it is larger than the sum of its proper divisors (44493).

11983891 is an equidigital number, since it uses as much as digits as its factorization.

11983891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44492.

The product of its digits is 15552, while the sum is 40.

The square root of 11983891 is about 3461.7757004173. The cubic root of 11983891 is about 228.8403570697.

It can be divided in two parts, 11 and 983891, that multiplied together give a palindrome (10822801).

The spelling of 11983891 in words is "eleven million, nine hundred eighty-three thousand, eight hundred ninety-one".