11991744 has 84 divisors (see below), whose sum is σ = 34869120. Its totient is φ = 3939840.

The previous prime is 11991743. The next prime is 11991773. The reversal of 11991744 is 44719911.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 11991699 and 11991708.

It is not an unprimeable number, because it can be changed into a prime (11991743) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 62689 + ... + 62879.

Almost surely, 2^11991744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11991744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17434560).

11991744 is an abundant number, since it is smaller than the sum of its proper divisors (22877376).

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

11991744 is a wasteful number, since it uses less digits than its factorization.

11991744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 305 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11991744 is about 3462.9097591476. The cubic root of 11991744 is about 228.8903322385.

The spelling of 11991744 in words is "eleven million, nine hundred ninety-one thousand, seven hundred forty-four".