11981288 has 32 divisors (see below), whose sum is σ = 24680160. Its totient is φ = 5407680.

The previous prime is 11981273. The next prime is 11981297. The reversal of 11981288 is 88218911.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14831 + ... + 15617.

It is an arithmetic number, because the mean of its divisors is an integer number (771255).

Almost surely, 2^11981288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11981288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12340080).

11981288 is an abundant number, since it is smaller than the sum of its proper divisors (12698872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11981288 is a wasteful number, since it uses less digits than its factorization.

11981288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 973 counting only the distinct ones).

The product of its digits is 9216, while the sum is 38.

The square root of 11981288 is about 3461.3997168776. The cubic root of 11981288 is about 228.8237871987.

The spelling of 11981288 in words is "eleven million, nine hundred eighty-one thousand, two hundred eighty-eight".