11981120 has 28 divisors (see below), whose sum is σ = 28530804. Its totient is φ = 4792320.

The previous prime is 11981117. The next prime is 11981131. The reversal of 11981120 is 2118911.

It can be written as a sum of positive squares in 2 ways, for example, as 5345344 + 6635776 = 2312^2 + 2576^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18401 + ... + 19040.

Almost surely, 2^11981120 is an apocalyptic number.

11981120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11981120 is an abundant number, since it is smaller than the sum of its proper divisors (16549684).

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

11981120 is an equidigital number, since it uses as much as digits as its factorization.

11981120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37458 (or 37448 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 11981120 is about 3461.3754491531. The cubic root of 11981120 is about 228.8227176817.

The spelling of 11981120 in words is "eleven million, nine hundred eighty-one thousand, one hundred twenty".