11981648 has 20 divisors (see below), whose sum is σ = 26531040. Its totient is φ = 5134944.

The previous prime is 11981639. The next prime is 11981659. The reversal of 11981648 is 84618911.

11981648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 53378 + ... + 53601.

It is an arithmetic number, because the mean of its divisors is an integer number (1326552).

Almost surely, 2^11981648 is an apocalyptic number.

It is an amenable number.

11981648 is an abundant number, since it is smaller than the sum of its proper divisors (14549392).

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

11981648 is a wasteful number, since it uses less digits than its factorization.

11981648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106994 (or 106988 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 11981648 is about 3461.4517185713. The cubic root of 11981648 is about 228.8260789874.

The spelling of 11981648 in words is "eleven million, nine hundred eighty-one thousand, six hundred forty-eight".