11991368 has 8 divisors (see below), whose sum is σ = 22483830. Its totient is φ = 5995680.

The previous prime is 11991313. The next prime is 11991373. The reversal of 11991368 is 86319911.

It can be written as a sum of positive squares in only one way, i.e., 7739524 + 4251844 = 2782^2 + 2062^2 .

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

It is a super-2 number, since 2×11991368² = 287585813022848, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 749453 + ... + 749468.

Almost surely, 2^11991368 is an apocalyptic number.

It is an amenable number.

11991368 is a deficient number, since it is larger than the sum of its proper divisors (10492462).

11991368 is a wasteful number, since it uses less digits than its factorization.

11991368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498927 (or 1498923 counting only the distinct ones).

The product of its digits is 11664, while the sum is 38.

The square root of 11991368 is about 3462.8554691179. The cubic root of 11991368 is about 228.8879399353.

The spelling of 11991368 in words is "eleven million, nine hundred ninety-one thousand, three hundred sixty-eight".