11981128 has 16 divisors (see below), whose sum is σ = 23189760. Its totient is φ = 5797200.

The previous prime is 11981117. The next prime is 11981131. The reversal of 11981128 is 82118911.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 11981128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23908 + ... + 24403.

It is an arithmetic number, because the mean of its divisors is an integer number (1449360).

Almost surely, 2^11981128 is an apocalyptic number.

It is an amenable number.

11981128 is a deficient number, since it is larger than the sum of its proper divisors (11208632).

11981128 is a wasteful number, since it uses less digits than its factorization.

11981128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48348 (or 48344 counting only the distinct ones).

The product of its digits is 1152, while the sum is 31.

The square root of 11981128 is about 3461.3766047629. The cubic root of 11981128 is about 228.8227686113.

The spelling of 11981128 in words is "eleven million, nine hundred eighty-one thousand, one hundred twenty-eight".