11440721 has 4 divisors (see below), whose sum is σ = 11447652. Its totient is φ = 11433792.

The previous prime is 11440699. The next prime is 11440753. The reversal of 11440721 is 12704411.

11440721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12704411 = 59 ⋅215329.

It can be written as a sum of positive squares in 2 ways, for example, as 10857025 + 583696 = 3295^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 11440721 - 2⁶ = 11440657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11440693 and 11440702.

It is not an unprimeable number, because it can be changed into a prime (11440321) by changing a digit.

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, 605 + ... + 4821.

It is an arithmetic number, because the mean of its divisors is an integer number (2861913).

Almost surely, 2^11440721 is an apocalyptic number.

It is an amenable number.

11440721 is a deficient number, since it is larger than the sum of its proper divisors (6931).

11440721 is an equidigital number, since it uses as much as digits as its factorization.

11440721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6930.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 11440721 is about 3382.4134874376. The cubic root of 11440721 is about 225.3293678231.

The spelling of 11440721 in words is "eleven million, four hundred forty thousand, seven hundred twenty-one".