11998891 has 8 divisors (see below), whose sum is σ = 12528000. Its totient is φ = 11478720.

The previous prime is 11998859. The next prime is 11998927. The reversal of 11998891 is 19889911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11998891 - 2⁵ = 11998859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11998391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 585 + ... + 4933.

It is an arithmetic number, because the mean of its divisors is an integer number (1566000).

Almost surely, 2^11998891 is an apocalyptic number.

11998891 is a deficient number, since it is larger than the sum of its proper divisors (529109).

11998891 is an equidigital number, since it uses as much as digits as its factorization.

11998891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4469.

The product of its digits is 46656, while the sum is 46.

The square root of 11998891 is about 3463.9415410772. The cubic root of 11998891 is about 228.9357955818.

The spelling of 11998891 in words is "eleven million, nine hundred ninety-eight thousand, eight hundred ninety-one".