11988911 has 8 divisors (see below), whose sum is σ = 13647744. Its totient is φ = 10424920.

The previous prime is 11988887. The next prime is 11988917.

11988911 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 11988911 - 2²² = 7794607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11988917) 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, 23441 + ... + 23946.

It is an arithmetic number, because the mean of its divisors is an integer number (1705968).

Almost surely, 2^11988911 is an apocalyptic number.

11988911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11988911 is a deficient number, since it is larger than the sum of its proper divisors (1658833).

11988911 is a wasteful number, since it uses less digits than its factorization.

11988911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47421.

The product of its digits is 5184, while the sum is 38.

The square root of 11988911 is about 3462.5006859205. The cubic root of 11988911 is about 228.8723060203.

The spelling of 11988911 in words is "eleven million, nine hundred eighty-eight thousand, nine hundred eleven".