11838891 has 4 divisors (see below), whose sum is σ = 15785192. Its totient is φ = 7892592.

The previous prime is 11838887. The next prime is 11838901. The reversal of 11838891 is 19883811.

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

It is not a de Polignac number, because 11838891 - 2² = 11838887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11838821) 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, 1973146 + ... + 1973151.

It is an arithmetic number, because the mean of its divisors is an integer number (3946298).

Almost surely, 2^11838891 is an apocalyptic number.

11838891 is a deficient number, since it is larger than the sum of its proper divisors (3946301).

11838891 is an equidigital number, since it uses as much as digits as its factorization.

11838891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946300.

The product of its digits is 13824, while the sum is 39.

The square root of 11838891 is about 3440.7689547542. The cubic root of 11838891 is about 227.9136522827.

The spelling of 11838891 in words is "eleven million, eight hundred thirty-eight thousand, eight hundred ninety-one".