11988169 has 4 divisors (see below), whose sum is σ = 12003460. Its totient is φ = 11972880.

The previous prime is 11988157. The next prime is 11988187. The reversal of 11988169 is 96188911.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3196944 + 8791225 = 1788^2 + 2965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11988169 is a prime.

It is a super-2 number, since 2×11988169² = 287432391945122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11988139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6402 + ... + 8059.

It is an arithmetic number, because the mean of its divisors is an integer number (3000865).

Almost surely, 2^11988169 is an apocalyptic number.

It is an amenable number.

11988169 is a deficient number, since it is larger than the sum of its proper divisors (15291).

11988169 is an equidigital number, since it uses as much as digits as its factorization.

11988169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15290.

The product of its digits is 31104, while the sum is 43.

The square root of 11988169 is about 3462.3935362694. The cubic root of 11988169 is about 228.8675842471.

It can be divided in two parts, 119 and 88169, that added together give a palindrome (88288).

The spelling of 11988169 in words is "eleven million, nine hundred eighty-eight thousand, one hundred sixty-nine".