11864891 has 4 divisors (see below), whose sum is σ = 11903112. Its totient is φ = 11826672.

The previous prime is 11864863. The next prime is 11864893. The reversal of 11864891 is 19846811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19846811 = 19 ⋅1044569.

It is a cyclic number.

It is not a de Polignac number, because 11864891 - 2¹⁰ = 11863867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11864893) 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, 18641 + ... + 19266.

It is an arithmetic number, because the mean of its divisors is an integer number (2975778).

Almost surely, 2^11864891 is an apocalyptic number.

11864891 is a deficient number, since it is larger than the sum of its proper divisors (38221).

11864891 is an equidigital number, since it uses as much as digits as its factorization.

11864891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38220.

The product of its digits is 13824, while the sum is 38.

The square root of 11864891 is about 3444.5451078481. The cubic root of 11864891 is about 228.0803746075.

The spelling of 11864891 in words is "eleven million, eight hundred sixty-four thousand, eight hundred ninety-one".