11981384 has 8 divisors (see below), whose sum is σ = 22465110. Its totient is φ = 5990688.

The previous prime is 11981363. The next prime is 11981393. The reversal of 11981384 is 48318911.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 2184484 = 3130^2 + 1478^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 8.

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 as a sum of consecutive naturals, namely, 748829 + ... + 748844.

Almost surely, 2^11981384 is an apocalyptic number.

It is an amenable number.

11981384 is a deficient number, since it is larger than the sum of its proper divisors (10483726).

11981384 is a wasteful number, since it uses less digits than its factorization.

11981384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497679 (or 1497675 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 11981384 is about 3461.4135840723. The cubic root of 11981384 is about 228.8243983469.

The spelling of 11981384 in words is "eleven million, nine hundred eighty-one thousand, three hundred eighty-four".